Am I running Rich

I have a Gen 1 with the following mods. Holeshot jet kit, Holeshot ais removal kit, Yoshimura slip on.
After running with out the AIS system I have noticed more soot in the exhaust tip, when the remove the slip on silencer insert. The plugs look ok. I have been getting around 36 mpg. Should turn the screws in a quarter turn, or should I remove one of the washers on the needles. I am close to sea level below 200 ft.
 
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