Glen's right; patience is a virtue here - I don't adjust any neck 1.5 turns at a time
Necks and truss rods are a curious lot, and what works for one in a heartbeat can often take days to work on another. Your problem with a neck that doesn't appear to be adjusting properly can be antagonized if you recently acquired the guitar from another area in the country - the guitar needs time to aclimatize to your region's humidity and temperature. My JPM100 came from the prairie and needed nearly two months in my home before the neck settled in properly and would adjust the way I wanted (my problem was insufficient relief for a while, there).
That being said, you are right in presuming that the "righty-tighty" rule applies to the USRG 10's neck adjustment bolt, and tightening the bolt should decrease relief. I have a USRG 10 and the neck adjusts instantly to any changes I make to the adjustment bolt - even very subtle ones (a quarter turn) show quickly. If your neck adjustment was "loose" in the first place, the resistance you're now feeling as you tighten it may be the normal resistance you feel as the neck bar begins to push against the string pressure; then again, maybe there's a problem. I would try two things: I'd tune down a full step or more and let it sit for a day or two, then see. If the relief is still too great, I'd turn the bolt a quarter to half a turn and check again a day later. If the resistance is too great and the bolt will not turn with a moderate amount of pressure, I'd play it smart and get the guitar to a pro.
One of the design "problems" with the USRG guitars is that there is a very obvious hole in the side of the neck near the heal, and inside that hole is a bolt that I think
supports the flex point of the neck bar. Some owners seem to think that this is where you should adjust the neck bar to set relief, and go in there and turn the bolt - of course, nothing happens so they turn the bolt some more, and then some more, and etc., which can result in the bolt coming loose and the steel neck bar floating free inside the wooden neck, making it impossible to adjust relief. I've never seen this happen myself, but I've received emails from people who've had it happen to them. I presume it can be "fixed" *(if a bolt falls out of a hole, you should be able to get it back in, right?) but imagine that it's a delicate job, that may require putting the neck in a press to straighten it appropriately first. That's probably not the issue here, but I'd take the guitar to a luthier if I was the least bit unsure. *
Hope this helps.
(Edited by Jimi D at 3:43 pm on Mar. 11, 2001)