Theres no way a sensored system should glitch like that, unless there is serious radio interference- what radio are you using? As for gearing:
Its the final drive ratio that is most important (since you are running an emaxx tranny but revo diffs). I would say chuck your numbers into BrianGs calculator and see what it says; just bear in mind your tire diameter if it is larger than stock, and the weight of the truck rtr (stock emaxx is 9lbs I think).