TailTwister,
I am using one 225 each (NOT metal-gear) on the rudder and elevator of the GP Cap (.40 size). The plane is powered by a O.S. .70 four-stroke. I have been flying it since last May (maybe 50 or so flights) and the only problem/complaint that I have is the rudder-servo is not quite enough for a knife-edge loop (or, maybe I just don't have the skills!

)