That`s the best you can do with the pickups, to swap them out. Had a 505 fretless, sounded good, but the pickup did not match the fretboard radius. So the B-String an the G-string had less output than the other 3 strings. An Ibanez man told me: Buy a compressor an I said build in other pickups.
The bass feels and playes well, but will not sound with these pickups.