I hesitate to add here, since I haven't a clue what types of skis in the abstract are good on severe crust. I happen to have a pair of skis that make bad crust easy, however, at least here in Colorado, so I'll mention them.
Fatypus D-Senders 106 - 186, I think is the length (a brand made here in Colorado). From maybe four years ago. The D-Sender is still in production, with changes that probably make it better: mine have small rocker tip and tail, and the current ones have more. Other skis I have work well too for crust
(Rossi Sickles 111, K2 Pettitor 120), but the Ds just are able to make it easier, more tank-like: on the few days when nobody is skiing snow off piste with a thick re-freeze layer suspended somewhere in the powder layers, there I am, happy as a duck.
That said, not sure if they're all that great in tight trees, like
@Josh Matta & the Renegades. (Sounds like a great name for a rock band, eh?) They do more short to mid GS-like turns, I think, in fairly versatile manner - around 14 to 25 radius, maybe, at least for me. That said, I'm not asking for much slarving/pivoting from them, but mostly carving behavior, as near as I can tell. (The next generation version with more rocker probably has more of that pivot, though). So I'm not sure, either. I have never tuned them for extra slarve, nor afterwards tested them for pivot. Also, these skis might slarve/pivot well in really steep, awful terrain, not sure. I don't go there any longer.
The D-Senders were originally a pro big mountain comp ski, in 192 or something, with successful competitors using it for extreme competition. Mine were the next size down, and with a bit less of the burly construction, apparently, of the true comp length. Also, this model was in a design transition - to more rocker at both ends, and my year, only the top comp model had that great rocker, whereas mine were the last that didn't (unbeknownst to me when I got them used and cheap). So mine really require, for me, a centered, square-shouldered approach - to really emphasize that I am square and centered in the direction the ski is traveling, steadily. Then it works, in fairly forgiving manner.
My feeble stab at describing the shape of these otherwise: they are fairly straight (little sidecut), and stiff. Fat and stiff. They have just a bit of float up front, to act like an ice-breaker a bit, riding up over a bit, then crushing through. Then the rest of the ski (and me) follow in the broken channel. (By contrast, the Sickles carve a bit more underneath, dependably, and yet can pivotslarve well also, once down there; and the K2 Pettitors, in the 189/191 length, bulldoze, float and slarve through thick crust all at once, very stiff also. So what they all three may have in common is little side cut and stiff running length for most of the ski (though not in the last bit of tip and tail, each slightly differently. They all three kill crud in general, and can carve very well on groomers. But only the Pettitors truly float. And only the D-Senders are up for that rare (at least around here) truly awful crust day off piste.
Note: there is another ski that is similar to the D-Sender, also with its roots in being a pro extreme comp ski: it's the first ski Black Crows made, the Corvus, also around 106 in width, I believe. I demoed that ski, and sought out crud with it. Although I only skied it that one, fairly normal "day after," it seems to me that it also may behave like my D-Senders, and be a good candidate for a bad crust (stiff, fat, little sidecut, more rocker like the actual comp ski. But in shorter lengths, at least the Corvus now is toned down and less burly than this ski was originally, I gather.)
, my skiing was too (still is I think) 
