Assuming you are using a nitro engine, you might try a wood prop before adding any weight to the rear of the plane. The wood props are quite a bit lighter than nylon composite or plastic. And it is true ... if you get the CG too far back, the elevator will have too much authority. I can dial it down with my dual rates, but it still takes a bit of finnesse and a whole lot of practice. You should be ok though if you start off staying within the Mfgr CG range. I didn't mean to sound like you should go straight for the throat and move the CG 2 or 3 inches back from where it is suggested. As a matter of fact, none of my planes have gone past 1/4 inch from the range the manual suggests. I just like landing tailwheel first.