Fender Fidelitron Cabronita Bass Pickup Adjustment

Im having some issues with adjustment with this pick up...Need some help or advice.

There are only 2 screws (one on each end) on the pick up. I felt I was losing some highs and was messing with it. I raised the pick up equally on both ends. The higher strings were finally coming through better but then the lower strings was now smacking the pick up when i play. I play with a pick and can be somewhat aggressive live. Can the polls be adjusted and if so what should the distance to the string be? adjusting one side or the other dont seem to be working out right. Am I missing something with this kind of pick up?? What should the pick up height be???