To keep it simple just use the heat cycle method/traxxas method....go the the engines section here on rcnt and check out the stickies at the top of the page
What I mentioned was you may have one too rich and the other too lean!..it's not all that difficult to do really,..set back to factory with the 1mm "at largest" idle gap...those trx mills like to be run a little on the hot side so don't be scared when Temps start reaching 260-280...260 is about...
Mill=engine....
Man I wish you would of asked us earlier on,the $ you said you spent on replacement engine parts+time involved you would have been better of just doing the traxxas trade in deal!......sounds to me you may have your needles backward ontop of the p/s being worn out bud