I have a 3 pickup Huntngton, and the output on the E string has lower output than the other 3 strings. ---I've changed the strings. Still the same. ---I changed the pots (because of the taper), so I know it wasn't anything electronic. ---I raised the pickups on the low end, THAT raised the volume on the A string proportionally to the E string, so it didn't help. ---I singled out each pickup, and the E string is lower in volume on all 3. I'm baffled. I've owned lots of basses. Never experienced this before. Any thoughts?