Tiny Moose,
I am curious if your coach wants your inside leg pulled in all your turns, or if there is a different reason for the suggestion. The only reason I ask is that there will be tip lead in super short radius turns when they are done correctly or most efficiently. These PSIA demo videos show a lot of it in pivot slips, which is the shortest radius possible. Less or almost no tip lead is visible in Super G and DH race turns, where skier is indeed more square over skis. Meaning, less upper lower body separation, but as a result of a very different radius, and less direction change.
I wonder if what the coach is seeing is a lack of pressure on the inside ski? Or is there aft pressure overall? Or are you leaning to far to the inside on the second half when you should be moving towards the new turn? It is so hard to know.
The suitcase thing I do not understand. Unless the idea is that there is a suitcase on the valley side and you need to bend knees and body to be able to reach it down there?
Pulling inside leg back has never worked for me either. Nor does long leg short leg, even though both concepts make visual sense to me. My point being that some movements when we try them don't accomplish the goal that we visually understand needs to happen, and only end up making us move in very strange ways that make no sense.
How do railroad track turns, aka perfect carved turns where you leave no skid mark at all work out for you? Do you play around with angulation from the knees versus the hips some in your training?
Personally, when a suggestion does not work for me, I put it on the back burner...sometimes for years. If I try it again, and it still holds no value, I leave it be, and look for another approach to correcting the same issue.
Bonne chance, and keep having fun skiing!