I believe your J PUP is a Noiseless, so it's built like and acts like a Humbucker.I typically have my P up all the way then adjust my J until I like the tone (separate volume for both). I usually do this on all my basses, the neck pickup on full then add bridge until I like the sound. I should mention that I play Spectors almost exclusively and the have an active tone circuit. The one exception is my Fender USA Deluxe Jazz fretless. I do the same thing, but unlike most Fenders, it has an active tone circuit.