I also bought this pick up for my Music Man but I'm slightly dissapponted with the result. I'm missing the crisp sound I used to have with the standard pick up. There is a chance I have made a mistake with placing the pick up. Does anyone have a wiring scheme? because this was not placed on the Bartolini site.
There is a good chance that you simply don't like the pickup. To my knowledge, Bartolini MM pickups usually do sound "darker" and more "mellow" than the MM stock pickups.