hey so a few months back I paid a tech to swap out the pickups/sustainer systems between a schecter banshee elite 7 (sustainiac) and a fernandes revolver 7 with their proprietary sustainer. Basically, I loved the extended scale and feel of the schecter, but wasn’t enjoying the Sustainiac. The fernandes was not as nice of a guitar, but I got on better with its sustainer - for clean playing and sustaining chords I found it much more appealing. The sustainiac tended to sustain mostly the low strings, despite lots of tweaking...so I paid a reputable tech to put the fernandes electronics in the schecter. He claimed it was really straightforward, but things have not been quite right with the guitar since; I was initially getting a high pitched squeal when engaging the sustainer, as well as super scratchy pots. Both have mostly gone away, but now the harmonic mode is pretty weak, and when I put the neck pickup on alone, the sound is thin and biased largely toward the treble strings; the bass is super weak in neck position and much louder in bridge position. I’ve already gone back to the guy, but he just tweaked pickup height, cleaned the pots, and claimed everything was fine. But the guitar sounds lifeless at best. Before I go back to him again, I’m wondering if anyone has a guess as to what’s up, so I can be more informed when trying to convince him there’s a problem. Thanks.