I have an Ibanez Sr-400 with the pj combo pickups in it. I love how this bass plays but hate that ever since I bought it the J pickup has had a problem with the E string's output being considerably higher than the other strings. The only way I can find to fix it is to change the pickups out for some new ones, and I wanna put a set of bartolinis in it. I had just a few questions about this. 1. I heard that I'll have to route the bass for the pickups to fit, and was wondering how much it needs to be routed and where? 2. What might this make my bass sound like? I haven't ever heard a bass with bartolini pj pickups in it and was wondering what kinda tone they have? Thanks for any help.