I have a couple questions regarding pickup and pole height. How close to the strings can a humbucker be raised before it starts effecting the sustain (negatively)? I'm trying to get the most volume, clarity, and sustain out of my 53/10s, been playing around with the pickup height. Also, the poles on my 53/10s are sunken below the cover a bit (see pic). Would raising them all an equal amount effect the sound/signal differently that raising the whole pickup?