i would go back to the single base gasket and jet according to the jettingchart here (or by your feel) without looking at spooge.
then i'd look at what oil you're using, and look for an oil with lower flash point (wich is what i also need to do) my ec 200 has even more spooge, but runs superb!
i also have been thinking about getting a hotter plug like br7eg but i'll try a different oil first with a repack of my muffler.
it's no use to give you my carb setting since i have a 200 and yours is a 300.
NECJ/NEDW is fairly lean, some run well, others detonate.
if you get detonation, go for a richer needle.
listen carefully at your engine, feel the character, listen to the exhaust sound changing with different jetting, feel the throttle response.
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