today I made a picture during Cruise with Autopilot at 7500ft with following configuration:
770 kg 40l in header, 20l in each wing (80l total), 75kg and 83kg for pilot and co.
Flap was on 7° reflex CG 26,20"
My design CG is 22,8 - 30,3 from firewall back, horizontal was installed - 0.6°
So it looks like if I would add more reflex than 7°, I would need more down elevator.
So the gain with the higher reflex would be lost with the down elevator....