FWIW, I'm 6'1"/~215lbs and having the time of my life on 150cm Atomic SL11's.
I bought them to "play" but have had so much fun slicing tight little ruts in the snow that nothing else has come out of the locker for the past 3 seasons. I've even trained GS with them and felt perfectly comfortable and stable (as long as they were locked on edge and I remained centered). I also have SL9's in 150 and ran GS with them too--- scary!
The only time I haven't enjoyed the shorties is last spring in the deep wet untracked snow of Whistler's upper bowls. It was hilarious trying not to face plant, but not the most fun I've ever had. ...hey, short skis travel easy...
Since I now live in New England, the 150's work in just about any situation I've run across. Have nearly new SL 9.16's in 170 and 180, and "brand new" 205cm Rossi 9S's in the locker, but they aren't getting any use. I think I'm "stuck in a rut".