I have a 5 string BSX Allegro and I've had trouble with the pickup on the highest string. I've adjusted the individual volume adjustments in the back panel, but I've still had the same problem. Basically the volume of the highest string (I've used both low B and high C tuning) is lower than the rest of the strings no matter how I adjust it. Has anyone had a similar problem? Since this is a proprietary pickup, I'm not sure whether I can just take it in to a regular repair shop.