Have you taken the time to actually try moving your bindings to duck or playing with your binding angles sometime in those 3 years of riding or have you suffered this whole time.
I'm Goofy and duck and ride 15/15 this is a little more aggressive but my natural foot stance is fairly Out-Toed meaning my feet don't point straight.
It took me many tries at different angles over a fairly long time to figure out what worked best.
Do you have any video of yourself, maybe you are riding heavy in the seat and you nor your friends have noticed it. Just because they can ride very well, if that is the case, doesn't mean they can pinpoint this little body movements.
Something is not right either with your setup or your body as you already know. Riding down half a run and stopping from pain isn't right