Sounds like you got a bum tree. But if there is no other tree to move to you have to do what you gotta do. I've used tree limbs with a "V" in them as a brace to the tree base and ratchet straps to draw it in nice and tight. Believe it or not, the wood of the tree makes less metal sound when asending. Your situation is not hard to remedy with a 2x4, a notch cut into it and a couple ratchet straps. Done it a million times,,,infact, just about a month ago. Ratchet strap fan here for sure !