Well, while I admit I know nothing about DDO late game, I do know pen and paper, perhaps fixing the mess that moved two weapon fighting from being best used only with precision damage like sneak attack, to must have source of damage would help, this would also diversify builds late game adding freedom and variety.
But then I am biased in that Id like a much more by the book experience on several fronts. But By the source material Two Weapon fighting is manifestly too good as stands. (and I say that as a huge monk fan who relies on TWFing feats there in.)