CHOAS
I have been running GXII motors all year with the 3 needle carb, this is how i run mine ... lsn needs to be about 1/2 to 3/4 turn out from flush, any leaner and you starve the motor of fuel at idle, msn as you have it flush, hsn, all my motors are 1 1/2 plus turns in from flush, even while running in i was over 1 full turn in...ldle gap i run is around 0.5-0.7mm depending on how much compression they have, also use the GO2072 pipe with these motors.
What is confusing with some of the carbs the factory supplys is they flush all the needles, that means lsn and hsn are way off.

I run 25% and 30% nitroX fuel OD 97 plugs and factory shimming.

Craig