I installed my first set of flats (GHS) the other day. I'm noticing that the E string isn't staying a consistent pitch as I try to tune and it seems to be getting worse. I only have one bass so I'm changing between E, Eb and drop D as I go through my song list. It've tried using just the front pickup with the tone rolled off and plucking at the 12 fret... doesn't seem to help. It's still wavering all over. I'm basically at the point where I have to ballpark it with the tuner, then play a chord and fine tune by ear. Just wondering if flats don't like being tuned up/down frequently? Or if there's something I'm not thinking of?