Cool! I'm glad that the pot switching thing worked!
Raising the treble side pickups should make them louder; it should also change the tone somewhat as well. I believe it is the case that the lower the pickups, the cleaner the sound. However, the difference in tone may not be appreciable.
The heavier strings should help cure the buzz problem.
Note that even though the truss rod nut is loose on the E string side, the nut on the G side still has an effect on the E side. So loosening the G side nut can help with an E buzz.
Go
here and read what Joey says about when you should adjust the nut. Generally, if you have buzz when playing an open string, a nut adjustment may address that. But my guess is that your issue is not enough forward bow, which would be truss rod adjustment or higher tension strings.