Why are you still using the restrictive stock air box?
The 130 main should be enough. But are you making WOT runs and shutting it down right away? THEN checking the plug?
Does your carb have an adjustable needle?
Not sure which way is rich on yours, but use a tachometer to help dial it in. Idle it around 1100 RPM and adjust the idle screw 1/4 turn in or out until you reach your maximum RPM.
USUALLY if you're more than 2 turns OUT, you need to go down 1 on the pilot jet. If you're less than 1 turn out, you need to fatten up the pilot jet. Ideal is 1 1/2 turns out.
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