Thanks for your reply Explorocam, that's very useful.
Never thought about balancing the motors, maybe that's to obvious... Will check it soon, on my Gaui 500x (that falls from the sky with a load) I checked for unbalance of the craft with iSeisomometer on the iPhone. There was some rumble in the craft but that was reduced using a sponge between the craft and the camera-mount.
I have a Du-bro balancer and balanced the 10" stock props of the F550 as good as I could, the hub seems to be off centre. I am thinking of switching to the 10" Graupners and hope to have a better result.
My biggest concern is the movement of the camera-mount. There is a margin in the gears of the servos that result in a wobble of 3mm on the mount on the roll. There is some margin on the pitch, but not so big. I think the prop-wash moves the mount on the roll axis.
I damped the movement of the craft I now use ammo of a nerf gun (these are kind of arrow of foam) between craft and mount.
Next experiment will be with a piece of sponge between the craft and mount. That worked good on the Gaui.
Might also try to find the moon gel.
Also I think of the use of the by AeroXcraft recommend Futaba S3156MG servos and Align Servo Horn Set HSP41003T. These servos have more torque on 5v than the Savox (Futaba 28 oz-in Savox 11.1 oz-in)
All I can tell you, is this is frustrating.
No I don't think so, it's a steep learning curve :nevreness:.
upd00: Did some stabilising in After Effects, that didn't work on the jello effect.
upd01: Have just ordered the Graupners, hope to have better results.
upd02: Have also ordered the recommended Futaba S3156 servos and Align servo arm.