I’m 5’10” 147lbs, about a lvl7 skier and have had no problem with atomic/volkl race skis (consumer versions) or dynastar mythics (which have a stiff-ish reputation). I’ve tried slightly softer skis and they felt bendy and horrible.
As a lightweight I find I need to be more careful with boot stiffness rather than ski stiffness.
Careful what way? Making sure they're stiff enough, or not too stiff?
Making sure they are not too stiff, I'm skiing atomic M110s and would not want to go any stiff than that. I'm not sure why it seems to be more of an issue than ski stiffness.