I may have gotten my datapoints confused. A few years ago a friend and I skied with an old K2 Kvc (195 or 200 cm, considered a "slalom" if I recall correctly) on one foot and a k2 coomba (188 cm, 102 mm modern-before-rocker design) on the other. We were on an intermediate groomed run. We were amazed how similar the two skis felt. The only difference I noticed was that I caught an inside edge a lot more ofter on the kvc. And I thoght the reason that never happened anymore was because I got better !
But now that I think about it, the coomba may be more like 25 meter radius. The 40 m skis are those "big mountain chargers" that I don't like, aren't they?
One other revelation -- I skied those kvc's much better than back when they were my everydsy skis. A couple of years on various 12 to 15 m radius skis (and a lot of outside feedback) taught me to carve, even though I used to think I was hot stuff.