Levy, your biggest enemy next winter will be your desire for adrenaline rushes. I think I'm reading that speed is what you love about skiing.
To change your skiing form, you'll need to find some sort of pleasure in slow, deliberate practice with concentration on the way individual parts of your body are moving, not the wind blowing past your ears. That slow deliberate practice needs to happen on easy pitches, and you'll need to do it without your ski buddies. They won't have the patience to slow down with you. You'll need to enjoy this and believe in its future effect on your skiing, so you'll do it often enough for it to have an effect on your skiing once you get back on your regular trails.
Can you think of an activity you can do this summer that will help develop an appreciation for slow deliberate physical movements? I'm thinking tai chi, yoga, martial arts. There's also ice skating and inline skating. All of these focus on balance on your feet. Some of them may have the additional effect of addressing your range of motion.