Full scale aircraft balance all their flying surfaces to mimimize control input, improve control response and to avoid flutter. We usually get away with not balancing our surfaces because of the tremendous torque of our servos and the relatively slower speeds we fly.

But, we have all seen/heard flutter on high speed passes which in many cases may have been prevented if the offending control surface had been balanced. Most manufactures take this into account, either by calculation or trial and error, and will adjust their designs accordingly. I know BV adds lead to the leading edge of the stabs on their F-4 and the Cook Firebird balances all the flying surfaces. If you follow the manufactures recommendations and stay within the design speed envelope, you should be OK.

Craig