i fly stock servos on 6v with no reg. There a little twichy but i like it like that. havnt had any problem's with the servos and i have about 6 gallon's so far on the system. (IMHO) I think the stock servos are to weak and too slow on 4.8. If i had some good servos in there i would'nt mind 4.8.

Hope this helps