I have to agree with you on this Brett,, I know on my Impact that one time I taped the controls and the thing would hunt like a golden retriever,, then I retaped the controls and it pretty much went back to stable and locked in,, I had not sufficiently lubricated the hinge barrels to keep the tape from sticking and they felt free, but they had just a slight drag.... enough apparantly,,
Just to be clear, the tape wasnt really stuck to the barrel, it just drug on it,, It could have also been partly that the tape was stuck to the wing in the wrong place, regarless, it was ever so slightly sticky,, and the plane refused to track,, it was fine before and fine after,,
I know my new build I will be a lot more carefull about picking the best ball joints,, at its best my green impact still wasnt really locked down,,