Bill, I suspect that we can get away without those elevator aids. Full size aviation generally fly with a much more conservative CG position than we do. Thanks to that there's USUALLY lots of elevator authourity on our models and if it does seem like we are loosing the downforce before the wing actually stalls then it's easy to move our CG's back a little for a finer balance and reduce the throw to compensate for the boost in sensitivity. But in full size that would lead to mucho overcontrolling and possible spin scenarios so you seldom see that other than perhaps in aerobatic planes.

Dago Red. Your Citabrial may balloon when the flaps first drop but I suspect that if you let the model slowdown you can remove most of the down trim as the model reaches it's new flight trim. At least that's what I found with a glider I have. Of course if you're just using them for extra drag while the nose is pointed down so that the speed stays fairly constant then you would need to keep the down trim in there. Steep landing approaches being a fine example of that.