Jill -
We went through the same thing with Dayo. We were both at wits end as well when he began biting his love muffin Kim. We even emailed Dave007 about it and the reply was "Swat him away" when he does that in a nutshell.
Thats what we did (Not literally hitting him) by shooing him away wit our arms, shaking the head etc. depending on where he was going to land or bite. But, you need to do it before they land or try to bite.
It worked, BUT there are ALWAYS those times you MUST get them and just expect they are going to BITE, so fist balled, back of hand, clamp talons and take them away to where you wish to place.
This is a Grey once they decide THEY have a brain and WILL use it to chose what THEY want to do and when....
I know some peoples Greys are cuddle muffins even after sexual maturity, but I believe that is the EXCEPTION, not the NORM.