Hey, mind if I ask what tree arm you got. I have one I have been using for a few years now for my xl1s. Had to pay more for the arm to support a heavier camera. I use the supplied ratchet straps and make them go till they won't no more and still get camera shake. It is not as stable as expected. Keep in mind too what really p!@#ed me off was the fact that it is not an off the shelf arm, had to order it and payed well over $400.

Just curious if yours is stable and what cam you putting on it?