I have noticed on my previous flight, that when I attach the camera on the horizontal stabilizer using multiple parts to get it to the position, during the takeoff roll and the climb it suffers vibrations.
However, to use the multiple parts is really necessary to get the camera to the desired position. Probably if you use them, the are not “strong” enough to avoid the plane’s vibrations. I have noticed the difference on this flight, where we have installed the camera practically on the adhesive mount, and the quality of the video was very good and without vibrations:
On the flight back, I wanted to achieve a better perspective, so I have used an additional part to get the camera a bit higher (sorry, no picture available). The result was a lot of vibratios transmitted to the camera and you can see also the difference in the quality of the video. So try to install the camera as close as possible to the plane’s fuselage.
Let’s have look on this video, you can clearly see the virations, or not? 😉