Interesting, so how about some specs on your unit, like the frame type I presume is carbon fiber? if so what thickness and what about the arms?. Is this a self build or a kit, if a kit what kit?.
Most of the time, if you notice a wobble is could be down to gains, maybe you could post a vid of the wobble. Is it a slow wobble or a fast wobble, does it do it when hovering or when descending/climbing/forward/side to side movement?
Wobbles could be frame induced if your arms are not mounted to a solid frame, hence the questions above. Certainly would like to see a video of the wobble, might help us out. Did you ever try to contact the guys in the videos for setup information?
Also, don't worry about the GPS questions, I have never seen a GPS cause a wobble. Toilet bowl effect maybe, from wrong declination on the compass but not a wobble.
One other question, does it do this in all modes? I.E. GPS/Atti/Man?