Nothing has improved my powder skiing as much as my Rossi S7's, not my Watea 101's or Mythic Riders. The ability to float around and make super short turns, never tip dive and just play around in the deep snow is worth more than learning on skinny ski's. I've been doing things like ski tight tree's to jumping off 10+ drop and doing 360's that i would never have even attempted with my other ski's. Why learn on something that is inferior to rockered ski's in deep snow, even boot deep snow. We're out there to have fun, not struggle...or at least I am.
I still have to disagree. The OP is 6'0" and 240lbs, which is pretty much exactly where i was 2 years ago. He's big and needs to spread out his weight more evenly...especially on wide ski's when you need to get on edge. Not overly wide stance but more than what he is doing. Most likely widening his stance will allow him to become more balance while he is skiing. I had the same issue, a narrow stance didn't put me in a comfortable position that i was used to when i did really anything. Widen that stance and bend those knee's to bring your hole center of gravity lower and wider. Get those arm forward and don't let them get behind. It will bring him out of the back seat, and hopefully get more balance on those legs to stop twisting the ski.
I'm not an instructor, but i do know what worked for me and made me a much better skier.
Although cowboy turns would be a great drill for him as it will force him to not rotate. Wider stance widths than shoulder width have no place in any form of expert skiing. It just make it harder to turn because you have to larger lateral move now with your wider stance. You also do not want to lower your COG at all either, standing taller allows more range of motion and the ability to absorb bigger bumps.stance width should be effective and natural. If lower COG were better for skiing every women on the planest would have a significant advantage in skiing than every men as there COG are lower. What else is important is leverage. which is for most people somewhere between shoulder width and a couple inches of separation.
Before you bring up wide stance racers realize what you are witnessing is vertical seperation and not a wide stance in GS and SL racing.
what your doing i am sure stopped some of you old bad habits but you would ski better more place with a narrower stance(at least narrow than shoulder width stance). There is no question in my mind about that.
BTW I have been teaching for 9 years, and am a L3.