I have an E-Maxx and of course the stock servo sucks for that truck. I had the same problems with my Rustler and my son's Stampede. I still had problems with all even after servo replacement (even on the Maxx with a new airtronics 200 oz/in servo) problems were solved with the replacement of the stock servo saver with a Kimbrough heavy duty saver (#121 I think). You may have already tried this but a worthwhile $6 mod if not.