Cally, we are dealing with biting, pinching and hair pulling here too. When she is frustrated she lashes out. I too am doing as you do, but it doesn't seem to sink in. I do notice the biting only occurs when she is teething though. But the pinching is an on going thing.
I am hoping over time it sinks in. I guess repetition and persistance is the key.
I hate having a bully as a daughter.

Clare- hope tonight is better for you all. You sound exhausted.

I'm off to find chocolate.