I've had my Jesters for nearly a year now, had them mounted on some Atomic Punx first, now Line Chronics. For about 7 months ive noticed the toe piece lifts a fairly substantial amount (1-2mm) while im riding and even more when not clipped in.
yeah man, i used to have the same problem. I found that it was the plate on the under side of my ski boots like underneith your toes was really worn down. maybe try replacing that? they just screw on and off. that sorted the problem for me (: