Same problem here with the ds811's. One thing I noticed is that the tighter things got, and the more throw there was, the more they shook. I also noticed it was more on the return to center than anywhere else. If I moved the trims way to the right or left.. it gave a lot less probs. So.. I guess "They" (jr?) are saying this is normal.. great. there goes my idea of getting them fixed on the warranty. It seams like this is as bad as flutter and would tend to "tear apart" your plane. Is that not right?