Dennis, I am quite aware of using ballast in sailplanes when appropriate. When I competed in the 1996 US Soaring team selection finals I had an extensive ballast kit for the two models I flew ( one of them being of my own design ). However during the entire contest I nor anyone else used ballast simply because the weather conditions we had that weekend would not support it. Fast forward to the 2016 International Slope Race here in Ca. Winds started light but as the day continued the slope lift was so strong that although I had installed all the ballast my sailplane would hold in its ballast tubes, I was rummaging through my tool box for anything I could cram into the fuselage. So I am VERY familiar with adding ballast in a sailplane in order to FLY FASTER or farther. My point is that I do not see ballast being appropriate for the subject model in this thread.

Your other example of a 40% aerobatic scale airplane doesn't relate either. Shifting the CG aft for more effective elevator and rudder authority is NOT the same as increasing wing loading. As far as overall flight performance is concerned, I scored better with my 37lb Extra 330 then I did with my 40lb Extra 330. It's a bit easier to be precise with an airplane that carries less inertia from control inputs. Example, the lighter airplane will be easier to stop on the mark at the end of a snap roll or point rolls.