If you look at the video, these jitters occur on the ground without the prop running. But yea, it's a challenge. You don't perhaps have a link to that servo?? I'll check out the new design, but I'm otherwise happy with this mount.
Edit: I see the new design has the tilt on the CG of the GoPro, which is much better, and almost any servo will produce jitter free results. The design I have is constantly straining. I'm thinking of attaching a rubber band to help out :/
I wonder if FE or CXN will give me a slight discount on the new design... ?