Hi Nicolas,
I think your project is very interesting in terms of dynamic sailing. But in my opinion, the main challenge will be how to imitate the flight of a dynamic sailing bird (like an albatross) not for breaking speed records on circular trajectories but how to successfully perform enroute flights only by dynamic sailing - and not to transfer the foundings gained from the latter to Arduplane.
Like @Yuri_Rage, I think that scripting on the flight controller is the way to go.
Since we are also interested in dynamic sailing, my friend Matthias has designed and built an ingenious design , which had its successful first flight a few weeks ago. The performance data are impressive. In ground effect it doesn’t like to come down at all.
Can you say something about the aircraft you are using ?
Rolf