Have never had any reports of issues with wing incidence, I'm very curious about whether that change you made makes a difference.

It's pretty simple to convert the rudder to pull-pull, that would likely give you more rudder authority. It's a big rudder and the little servos are really being pushed to their limit.

You can drill a hole through the area where the control horns is mounted and install a 2"-2.5" long piece of 4-40 or 6-32 threaded rod with nuts and washers on either side. You'll need to cut slots in the fuse side for the cables, the servo tray is already installed to allow this.

I had a local customer report that this made a big difference for his style of flying.

TF