Richard, all of my cats have bitten me. I consider them love bites, but you have to let them know your level of tolerance.

I think you are already on the right track.......saying Ouch in a genuine hurtful voice, gets the message across.

It is a heck of a way to find out, but I know Rascal loves me, he can bite like a pro. My Ouch complaints have resulted in more gentle love bites.