Creating Destructible Trees

Ok, So I got pretty far, it breaks nicely etc. Last Main Issue I have atm is the weight of the trunk, atm when cutting the tree, chunks break off but if there is just one really small one left, this little chunk holds the whole tree, also when I then destroy that little chunk the rest of the trunk flys away some meters. So I would like so that it behaves like a proper heavy tree. It starts falling when the support is too weak and doesnt jump like a baloon tree when its on the floor. Though I couldnt find a setting for that yet.

Thanks in advance for your help