Hey I have a set of the L xs scuba spring straps on a set of XL SP twinjets. If I jam my foot into the pocket and really pull on the strap I can get it over my heel, but it seems to me it's too small. Is there an XL version available? How much extension past my heel should there be? Several other people at my shop have had to cut the cave line inside the spring, is that a viable option?