If you have mix conditions that are exceeding "known" limits of servos, you could have nailed it. I know full travel ATV on a JR at 150% will "overdrive" Hitec 5955's; you may have a mix that causes the "120%" suggested limit to be over.

Even though this is an engine thread - I'm quite sure many of us JR guys would like to know what your specific situation (mixes) is that produced that kind of a problem.

Please email me, or PM, or start a thread on the Radio forum. This is the kind of detective work that we all benefit from.