I recently put GHS Progressives (40-100) on my Geddy. The E string has a contact core, so I readjusted the E string saddle. The E string sounds magnificent below the 5th fret. But above the 5th, it sounds under-defined and muddy. The other strings sound fantastic all over the fingerboard. At first, I thought the E string was too close to the pickups. Well, the pickup height is normal: about 3.2 mm between the pole pieces and the E string when pressed at the last fret. What could be the problem?