You have a couple of options:
1) Lower both, or just the bass, side(s) of the pickup in the ring, unscrewing to lower. Go for half a turn at a time and see what you think. Use a quarter of a turn to fine tune when you get to the sweet spot.
2) Raise the pole pieces out of the pickup on all strings (by unscrewing them) or again just the bass side. This will weaken the magnetic pull slightly and give a little more clarity.
You may find a combination of the two works best, as it did for me. In my SC245 (with very balanced 57/08s) I raised the poles on the neck pickup and lowered them on the bridge. I set the bridge pickup slightly closer to the strings than the neck pickup, and lowered the bass side of the neck pickup to get the right balance.
Trial and error is the way to go. Good luck, and don't forget to make a note of where your pickups are now before you start adjusting things, so you can always go back to ground zero
