This time, I did not spray him but looked right at him and said NO in a loud, commanding voice and then repeated it when he tried to come near me. He seemed to get the message and stayed on his side of the couch. Then I put a bolster up so his access to me was more difficult. He breached the barrier once and I told him NO!
For the next 10 mins or so he stayed on his end of the couch and just watched me.
I am sure now that it's a combo of his stress (Robby ran this morning and then I did the whole couch cover swap thing which confused the heck out of him) and his wanting something from me. When I give him my full attention, he seems much less bitey but today, he had my full attention when he chomped. So I don't know what he wants. I'm absolutely positive that unless wildly provoked, he would not bite anyone else. So it's a communication issue between the two of us.
I sent an email to the vet's office. Dr. Lewis there, is the one who said there were things we could try. I'm ready to try. Biggie has turned into the most expensive cat on the planet.