I have a Warmoth J bass that sounds great but doesn't quite have that great burp tone with the bridge PU. Neck is maple, steel bars. Body is chambered swamp ash Pickups are DiMarzio Ultra Jazz. Passive V B T controls, .047 orange-drop cap. IIRC, the V and B controls are both 500k and the T is 250k. When I solo the bridge and roll the tone off I get a bump I'm kids as the tone hits 0 but it isn't as pronounced as I would like. I presume it is because I'm using split coil hum buckers rather than single coil?