My Yamaha RBX170 sounds pretty good...I've pulled the pickups very close to the strings and it has made a HUGE tonal difference...my P-style pup is OK...but my bridge pup is still a bit "hmmmm". when I dial in my J, the sound is very thin...I have to really push the mids on my amp to get a decent mid-range growl. Any suggestions on what to do? Perhaps new pups? Any suggestions. I've already decided to change out the pots, because they really only adjust in the last 1/4 turn and THAT is sooo very annoying. Besides, I wanna slap some chrome knobs on her too. Anyway...what IS in those cheap Yammy's anyway and what can I do to improve her...on a budget ($100 MAX).