Adding a few "What have I done?"s from the Mace death bit of ROTS might make Anakin into someone who genuinely conflicted, he knows what he did was wrong but his fury is trying to justify his actions.
I'm rather keen to trim that scene in ROTS to almost nothing (to create the impression that he actually died trying to save Mace) so it makes sense to reuse the dialogue.
Besides Anakin goes too quickly to "What have I done?" to bending the knee in that scene for my taste.
You could even add Padme coming in at the end of the conversation so she assumes that he is just upset over the death of his mother.