Is it only the spooge you are concerned about,& otherwise running good?
Leave the plug heat range as is.It would be rare to need a different heat range & changing it may just be masking another issue.
If there are no underlying issues your jetting should fine,if a little lean (in theory).
Couple of easy checks for elimination-
Check the choke is fully disengaging.
Check Power valve is operating correctly & fully opening.
Repack the muffler to remove the oil soaked packing.
Put some fresh gas in with a lower flash point premix.
Go ride the wheels off it.Life is good.
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