I only had kick out once and that was practicing with it when I first got it at ground height. If you get the strap/rope/chain tight then cam it down it sits well on the tree.
As for being short and going 1 stick - as long as you aren't racing it doesn't matter how many moves it takes. I find if I dont over extend each move then I dont sweat. I can fly up a tree with huge moves but I am sweating through all my stuff by the time I get to the top...YMMV though. I enjoy the simplicity of items to carry in, climbing most any tree, and rappelling down is lots of fun to boot!