Loupus,
You big beautiful Son-of-B#$%&. I may not know if going to 4.8v is better for you, but you just solved my elusive mystery. I have been running Hitec 645MG on 6v and didn't know where the twitching was coming from. No one could figure it out. I really don't need the extra torque so I'm going to switch out the 6 and go to 4.8v and run a test. THANK YOU!!!!!

George