I recently finished restoring my old Aria Pro 2 into playiable condition. Sounds pretty nice except that the G and D strings are a lot louder than the A and E strings, when the pickups are set at the same high. The G and D strings are good volume, but the E and A are really faint sounding. Is there anything I can wire in to bring them out? Is it a wiring problem maybe, or possibly a problem with the pickup themselves.