I had this oscillation issue too while others reported good performance. I tried tuning it a bit but didn't get it satisfactory. Eventually I looked at my values and compared them to the published default values (you find them in the tuning guide) and they were all ways off, even the ones I had never touched. I suspect that my unit was once installed in a different airplane and got refurbished and sent to me (hey, after my previous various experiences with Dynon this would not surprise me at all). I reset the settings to default values and have a much better performing system since. I still disable the autopilot when the air is rough but that might just be me preferring direct control under such conditions.