I had a SD Bassline Quarter Pound Pickup installed in my Geddy Lee in the neck position. The stock pickup is still in the bridge pickup location. When I roll both volume pots full up and the tone full up, it sounds like playing through a cardboard box. Absolutely no bottom end and quiet. Yet, when roll either the neck or the bridge back just the tinest bit, there is a massive increase in volume output and the low end returns. Is there a wiring issue happening here? I used to run both volume pots full on when both were stock pickups with no problem? I haven't yet looked at how the tech wired it as i was waiting to get some feedback from here. Thanks.