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The plug does look a bit wet. You'll get there with the tuning, I know I'm not going to have a better idea than you what's going on with it. I've never had a 2 stroke with plugs like that though. Plenty of black sticky stuff in the exhaust ports and exhaust but plugs looking a bit browner and drier. Hard to tell if it's a lot of low revs and low speed stuff whether that would make a big difference.
Basically you are saying increase the amount of air right :)