Its a shame that the Hitec servo's are becomming a problem, they used to be the most reliable of all at the price, I have just tried to use a bunch of 7955's with the Futaba HS series of Rx's they become all jittery and don't work as smooth as you would think they should, so put them inbetween an Orbit power Jack in case that was the problem and just the same responce, changed the Rx back to normal mode and all was fine, seems the new Hitec Digitals don't like the HS version of Futaba Rx's.

I would confront them and let them know that a lot of people are not happy with the new lower spec versions, Oh yes 5955's work fine on the Futaba HS Rx's.

Mike