... I've had the same thing happen only it was my right front one (I love lefts) and same same, never bottomed out so I know its just the pressure its put under. I got a new fin set (slightly bigger by a few millimeter) and now wonder, what about the box, is that going to break???
Logically speaking (seeing as I haven't actually tried it), but the NUB fin will help by not breaking, but, I'm sure you'd upset the boards ride????
Anyway, I'd be interested if you could try it, let us know how it goes, might end up really really loose!!!
cheers,
Robbie