Ed, I'm really not sure what kind of oak it is, but I think I've narrowed it down to either a Quercus serrata or a Quercus fabri, both of which are supposed to grow natively in Zhe Jiang, where I collected it. It's really hard for me to sort through all the identifying characteristics for each species and come up with one that fits perfectly with what I observe on this tree. I really need a professional to help me identify it.
edit: Quercus aliena is also a possibility..
With oaks you need to look at leaf, bark and especially acorn. The latter will give you the best info on species.
Such a good base here. I think I would chop back the lower trunk pretty hard.
I'm finding that it's difficult to make choices that involve burning bridges...