I have a yamaha RBX170 wich I recently modded with a set of Dimarzio DP126 pickups. The sound is SWEET, and when I use de P pickup only, the sound is HUGE! But when I dial in the J pickup the output drops quite noticeably . Enough to warrant a volume adjustment on the amp when playing or the mixing console when recording. The bass is wired with <a href="http://www.dcc.uchile.cl/~jagonzal/wiring.gif">dual push-pull 500k pots for series/parallel use</a>. So I wonder, is this a potential problem with the wiring or maybe I just need to lower my P pickup/raise my J to even it out?