If you don't have a ROS incorporated into your system you ain't doing this saddle thing right. You might as well just use a lock-on. The whole point is to hide your body with the tree and shoot completely around it. You can't shoot 360 degrees with enough stability to be accurate on a tree much bigger than a volley ball without a ROS. Pirouetting like a ballerina on a platform to get a shot is a good way to get busted and/or make a bad shot.
I use a two panel as well, Overwatch Transformer. It is great for sitting and leaning.