I recently set up my MIM Fender Jazz and installed some new Basslines SJB-3 pickups. However, I'm experiencing a slight "distortion" type sound when I pluck the E and A strings with decent force. It's more apparent on the E string, but I need to pluck very, very lightly to avoid it. The bass has an extremely small amount of fret buzz, but I can tell that's not the problem. Any suggestions?