My GT's are really beginning to show some wear and tear, andwhen I spin them in my hand they have a slight slightwobble to them. Some are more or less than others, but I can definetly notice.
While I agree with both Rob's and Rick's posts up above, you may want to look more closely at your arrows, too... if they're doing as you said. I'm not sure about how accurate a result you're getting out of spinning them in your hand, but sounds as though they definitely need to be checked out; that just may be accounting for differences in tears as well, though I would tend to agree that it's more of a bow-rest tuning issue than an arrow issue.
As far as string creep goes, if you're shooting binaries with a stock BowTech string... well, I just haven't seen any on all the bows I've been around. Not after the string is "shot in".