I fly an ASW27, which is a 15 meter glider with flaps. I am flying with the CG at 62% aft. I use down flaps while in a thermal and climbing; negative (up flaps) are used in cruise between thermals. typical thermals speed is 50 to 60 kts (with ballast) and 90 to 100 kts in cruise. This glider has a T tail and I need nose up elevator for thermal and nose down elevator for the cruise.
I notice that in cruise, the elevator is deflected down about 10 deg. Is that deflection creating a significant amount of drag that could reduce my glide performance? I have the ability to move the CG by dumping the ballast in the tail tank