One technique that has worked for me, is to concentrate on opening, or rolling out, your back knee when riding switch, as your muscle memory from riding normal will give it the habit of closing. A way to force this is to notch your front, normal, foot one degree past duck.
For example, last year was my first big season, and I always rode -12/12 (goofy). This year I switched to -15/15. Then after a week or so in OCT with no snow in sight I figured I better start working on switch, and about the same time I moved to -18/15.
Not only does this have the benefit of correcting your stance in switch, but it also moves your natural riding stance to a bit more forward (think alpine bomber) for speed and steeps.
I've always been a big twin, center stance, matched angles kinda guy, but this makes sense for me. Sticking to straight duck wont hurt.
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