What a truly marvellous idea, but if you will permit me to make a few suggestions:
1) You underestimate Legolas' power and constitution.
2) You most definitely underestimate Gimli's constitution.
3) Gandalf the Grey only a 4|2? Very significantly underpowered.
4) I would say the Balrog is overpowered. In fact, arguably, Gandalf the White > Balrog, which may also indicate that Gandalf the White is underpowered.
5) Treebeard's attack should not be weaker than Aragorn's.
6) Sauron may be slightly overpowered. In any event, the difference between him and Gandalf the White, though substantial, is not
that monumental.
(Granted, this is a humour thread, but I could not resist giving a few pointers)