I put my JB to the neck position and I'm really liking it. The question I have is in regard to the adjustable pole pieces. Does it make any difference in tone that they are closer to the bridge, as opposed to closer to the neck as I see in most neck pick ups? I guess, are they different than the non-adjustable pieces? Or is the difference just cosmetic/adjustability? (in that if I adjust them up or down they will be in a position that isn't as close to the neck)