I find it strange that people are so concerned with sidecut. If examiners can't tell a good skier on a slalom ski, shame on them. Can't get angulation on a slalom ski? What planet are they on? I guess Mikaela and Hirscher don't have much. Long turns? How long are we talking?
A Head Rally has about as much sidecut btw, 13.7m at 170. Versus 12.5-13 at 165. So really, with it's extra flotation due to width, the Rally is the cheater.
It's not the skis, it's what you do with them.
Having said that, I don't recommend a slalom ski for these things unless that's your thing. A 15m -18m ski 75-85mm is a good choice. It's the whole package though, flex, sidecut, profile, tip shape. Saying it requires "elite skills" to bend an 18m ski is strange. What if it's super soft?
Some people in psia are the same way about skis. Apparently there was some meeting where it was a talking point that people who ski slalom type skis don't "turn their legs". This then spread throughout the land. I heard that line last year, so I've spent most of this year on a 21m 180 cheater gs. I happen to like the ski. Nevermind I used to ski a 192cm 95mm, 22m ski at times. Or, straight skis years ago.
I ski no differently, I just don't hear the same comment. Me thinks the ma skills of some need improvement. Possibly now I'll pull out the 113cm elan carvers so I can hear about those.
Get something that you feel comfortable on and that supports what you're trying to do. I'd stay under 85mm. Personally I think a Rally is a wanna be for these things. Way too huge of a tip won't help in bumps. But if you feel great on it, go for it.