I had a declawed foster named Spliffy who was a very bad biter at first. I worked with her for six months. I would pet her, and watch her body language very closely. When she had enough she'd "box" you with her paw. I would walk away and try for another petting session later. Gradually she bit less and less. Not only was she declawed; she had had virtually no social life for her first 7 years and basically had to be resocialized.
BTW, Spliffy was successfully adopted in January, so there is hope.
I've been finally defrosted by cassiesmom!
"I look pretty young but I'm just back-dated, yeah!"-"Substitute", by The Who