I ski Squaw all the time (I guess is should say I used to before we bought a home in MT, but I have skied the mountain a ton). The skis I mentioned are all great skis for Squaw especailly after it gets skied out. To me rocker is only fun in the pow, but not in the crud and chop and we have to be honest, at Squaw that is what you have more of the time than untracked!! Icelantic Nomad is another ski that might work well. Ron can speak to this. Sounds like you would skip the Soft version and get the original.
If you want to go rocker, look at skis that just have tip rocker and less is better IMO. Skis that fit into that category include:
K2 Hardside
K2 Sidestash
ON3P Vicik
Moment Belafonte
Fischer Watea 101 (new version)
Line Prophet 115
There are others. If I can think of them I will post them.
I personally also like a hardtail. I don't take that much air and I never land switch, so I never need a twin tip. I have never skied the Sidestash which is supposedly a wider version of the Hardside. The hardside is a great ski for Squaw, reasonably stiff, minimal rocker tip (15cm), great in crud, will ski soft bumps well and floats nicely in the pow and rails on groomers. If the sidestash is the same only wider it shoud be a great ski. Hardsiide 98mm under foot, sidestash 108mm underfoot.