Hi. The 72 year old again. Playing with different skis, I've been skiing slush a bit lately: today and yesterday, for instance. At least three times a week, since that's all that's been open.
The K2 Pinnacle 105 186 really is probably the easiest, least tiring and yet top ski for that I've been on or know of first hand, a ski that is very accessible to advanced skiers of all sublevels (dang instructor pigeon holes). I'm referring to use on a wide range of spring slush/crud groomers, including steep.
For me, I'm mostly avoiding bump runs now too, like the OP. I get too tired, and it's too hard on my legs and stamina. When younger, I used to ski Pali, the same slope @tball showed, from first chair to last, day after day. Slush, crud or chaulk. Now, I avoid that, especially once the slush season arrives (and I'm only good for a few runs on Pali a day, or I lose too much edge too quickly). tball's tests of skis on Pali are interesting, indirectly maybe somehow applicable, but mostly maybe not what the OP asked for, and maybe misleading. Steep groomers and Pali steep slush moguls do not necessarily equate, in terms of ski choices. For example, his last choice there, the Sickles 111, are a terrific ski for spring slush groomers, both steep and non-steep, and crud skiing on groomers or mild off piste (areas that mildly bump up but get groomed maybe once a week or so). Better than the Moment Bibby Pros for that particular terrain/conditions, for instance. (I have and use both size Bibbys and Sickles also. While great in powder/crud, the Bibbys are relatively not so hot in slush, at least for me.)
On steep groomer slush/crud skis that are less taxing: Until it closed, I was happy as a duck over on the Beavers runs (some groomed and steep - again, like the OP said he prefers). I've found two skis best for me on steep groomers, including for slush and crud groomer days: 1. Rossi 165 FIS/WC spec SL skis: they can't be beat on steep groomers, chaulk, corduroy, crud and slush. I've been skiing exactly that terrain and those conditions for over a month there. If the OP can handle such a ski, then it's tops. But the next ski is close also. 2. When crud or slush get deeper, then I use either the SL still, or use a pair of Volkl V-Werks Mantras 99/178. My pair skis a lot like a fatter, versatile slalom ski, except it floats a bit and slarves when needed. Just tops in crud and spring slush both. (There is a further explanation to this ski for this use, but too much detail here, unless this ski is of interest to the OP or others wanting the same sort of top steep groomer or steep smooth slope ski.)
I've found a lot of combinations that work in slush on the groomers. I say combinations, because I may ski a narrow ski at first, for the re-freeze turning into slush, then a wider ski once it's oceans and mountains of slush. (FIS 165 SL, for instance, then V-Werks Mantras or Katanas or Sickles or k2 Pinnacle 105s, etc.) I think there are lots of both wider and narrower skis that fit the bill for slush in this way, but I've mentioned some of the great ones I use myself, rather than ones others folks have told me about.
Also:
In my experience, the V-Werks skis are much better in slush than the Bibbys (both the 191 and 184 V-Werks Katanas and my finally fixed 178 V-Works Mantras, even though all these are great in mid-season powder/crud.
Almost by accident, I also own the M5 Mantras, 178. Relatively speaking, these are no where near as good in slush, though fine in mild crud.
The K2 Pinnacle 105 186 really is probably the easiest, least tiring and yet top ski for that I've been on or know of first hand, a ski that is very accessible to advanced skiers of all sublevels (dang instructor pigeon holes). I'm referring to use on a wide range of spring slush/crud groomers, including steep.
For me, I'm mostly avoiding bump runs now too, like the OP. I get too tired, and it's too hard on my legs and stamina. When younger, I used to ski Pali, the same slope @tball showed, from first chair to last, day after day. Slush, crud or chaulk. Now, I avoid that, especially once the slush season arrives (and I'm only good for a few runs on Pali a day, or I lose too much edge too quickly). tball's tests of skis on Pali are interesting, indirectly maybe somehow applicable, but mostly maybe not what the OP asked for, and maybe misleading. Steep groomers and Pali steep slush moguls do not necessarily equate, in terms of ski choices. For example, his last choice there, the Sickles 111, are a terrific ski for spring slush groomers, both steep and non-steep, and crud skiing on groomers or mild off piste (areas that mildly bump up but get groomed maybe once a week or so). Better than the Moment Bibby Pros for that particular terrain/conditions, for instance. (I have and use both size Bibbys and Sickles also. While great in powder/crud, the Bibbys are relatively not so hot in slush, at least for me.)
On steep groomer slush/crud skis that are less taxing: Until it closed, I was happy as a duck over on the Beavers runs (some groomed and steep - again, like the OP said he prefers). I've found two skis best for me on steep groomers, including for slush and crud groomer days: 1. Rossi 165 FIS/WC spec SL skis: they can't be beat on steep groomers, chaulk, corduroy, crud and slush. I've been skiing exactly that terrain and those conditions for over a month there. If the OP can handle such a ski, then it's tops. But the next ski is close also. 2. When crud or slush get deeper, then I use either the SL still, or use a pair of Volkl V-Werks Mantras 99/178. My pair skis a lot like a fatter, versatile slalom ski, except it floats a bit and slarves when needed. Just tops in crud and spring slush both. (There is a further explanation to this ski for this use, but too much detail here, unless this ski is of interest to the OP or others wanting the same sort of top steep groomer or steep smooth slope ski.)
I've found a lot of combinations that work in slush on the groomers. I say combinations, because I may ski a narrow ski at first, for the re-freeze turning into slush, then a wider ski once it's oceans and mountains of slush. (FIS 165 SL, for instance, then V-Werks Mantras or Katanas or Sickles or k2 Pinnacle 105s, etc.) I think there are lots of both wider and narrower skis that fit the bill for slush in this way, but I've mentioned some of the great ones I use myself, rather than ones others folks have told me about.
Also:
In my experience, the V-Werks skis are much better in slush than the Bibbys (both the 191 and 184 V-Werks Katanas and my finally fixed 178 V-Works Mantras, even though all these are great in mid-season powder/crud.
Almost by accident, I also own the M5 Mantras, 178. Relatively speaking, these are no where near as good in slush, though fine in mild crud.