Maybe find a way to insert the idea that Grievous is Maul. If it can be done in a believable way. If not, find some other way to increse his threat.
If anything can be done to slow Anakins turn, any scenes after, "What have I done" where Palpatine convinces he's doing the right thing would help. The Removal of the line might help otherwise.
I agree on possibly moving up the Yoda duel. It did break the moment the first time I saw it, and It's still a bit sudden on the second time.