i had big trouble locking down my swups at rails all season. every time i did front switchup i would fall down before rail ended. then last week some guy at my local hill told me that Will Wesson and other pros use same method that is used in freestyle rollerblades. you just take angle grinder and make small cut under your inner edge!
been riding my "bladeskis" for a week now
here are some pictures of my prototypes: