Hi all,

Thank you very much for your advice. Much good input here Seems like everything is shortened down to:
1. Elevator linkage
2. Stab stiffness.

As the first one is easiest to chase first, I will try to take this one first. There was some play in the elevator which I traced down to the servo. Standard Futaba servos was mounted (new) but had some play in the bush/bearing. Replaced these with some more costly servos with ball bearings and metal gears. This instantly helped a lot. There is still a minor play in the linkage. Seems to be from the flex in the pushrod. Red type of Sullivan gold-n-rods have been used, and it seems that there is some clearance between the tubes inner diameter and the pushrod itself! Would the blue ones fit tighter in its sleeve? The rest is tight and good. I think I will do a testflight sooner or later and see if the servo swap help. Some pictures from the linkage: