I am running 605's on everything except the rudder which has a 645mg. (of course the throttle also had a standard servo) Had a supertigre 91 on it until an unfortunate throttle linkage breakage caused the throttle to stick wide open..... Talk about a handful.........About 2 minutes in to this wild ride the prop broke sending the engine into an unlimited rpm meltdown.......

The plane was landed safe and sound dead and is now the recipient of an OS91 4 stroke transplant

I did think about smaller servos at 6 volts, but the higher current draw equals much less flight time..........

Just some thoughts to ponder............