What about fret buzz? On the E string, all the way up I get fret buzz. Not as bad on the other 3 strings. I've also lowered the pickup a bit and it seems to still have that effect. I have yet to try the string trick...
I had a similar issue on 2 different G&L's. On both instruments and 2 different model GHS strings, loosening the strings until the barrels were ~1/2" out the back of the bridge and letting the barrels turn until they seated into the bridge resolved the issue.
The G&L bridge is the only one that I know of that holds the barrels from rotating as you tighten the strings. It's something to be aware of but certainly not a faital flaw given the tonal and sustain value this bridge brings to G&L instruments.