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You put all this tech work in but did you do a compression test by many chance? There's a lot of talk about the main piston o-ring but did you check the compression of the cylinder head and the nozzle?
Afaik every tech including myself has considered the Teflon tape mod as a temporary fix. The tape will eventually degrade or flatten with exposure to oil and that might be the cause of the air leak where you installed it on the cylinder.
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