Hi, I recently aquired a Hamer Korina Special. It comes equipied with a SD Dog-Eared p90. The issue I am having is that the high E string is noticeably quieter in volume compared to the other strings when the guitar is amplified. I know it is not a sting gauge issue, because when I play the guitar unplugged all the strings sound balanced & I can hear the string clearly. Does this sound like a pickup issue or is something else going on? I admittedly don't know much about pickups, so this might be a simple fix. I tried adjusting the screw below the string (I guess this adjusts pickup height?) and it didn't seem to make much of a difference. Are these pickups just voiced that way, or is it something I can adjust? Thanks for any insight.