Andy, go ahead and start at the 5" back that it is at now. Mine is somewhat past that now, (not sure exactly how far back). If you have a little expo on the elevator it should fly fine. Just to be sure you might want to use low rates for the first few takeoffs.

My high rates are now 45 degree's on the elevator and ailrerons, rudder max possible and thats howI fly it all the time.

Ed M.