Brett.....ahhh...I see what you are doing. I assumed you were using a flat feeler gauge.
edit....Brett....I added a 1oz header tank and that improved fuel feed considerably and virtually eliminated air in the line getting to the pump. This might help eliminate your misfire.
Will....I agree.
Truthfully....I have always questioned the "500" flights one or two well known individuals have claimed before problems occur.
Other than that....I never had much trouble until I started using the DZ series of engines. The rest of the engine is virtually unbreakable.
I had good use and reliability with the FZ pressure tank versions of 2 stroke and 4 stroke engines however I never tried the FZ175.
http://www.yspower.co.jp/en/engine/plane/fz175s.html
Has anyone tried the big FZ engines?
I might try one.