As a long time J player who has recently built a P, I found that I needed to re-adjust the ears to appreciate the virtues of the P. It's a thicker, woodier sound than the J and superficially has less clarity. However, it has other virtues - solidity and weight - that you come to appreciate in time. Not a lot of point in spending a lot of money trying to make a P sound like a J. Either use the J or spend some time acclimatising to the difference is my suggestion. Agree with others' suggestion about the QP pickup. It may be louder, but it diminishes, to my ears at any rate, the essence of a P bass - that lovely woody tone.