Some biting MAY be expected, but there's biting and then there's biting. This isn't "biting" in the sense of "I'm sending you a strong message that I'm unhappy in some way." This is "I love you and want to preen you, giant person, and because you're huge, I'm going to assume you're pretty tough and can tolerate very rough handling."
I feel your pain. My quaker is prone to this. He finds some bump or rough spot he doesn't like, and he'll try to "help" by scooping it out. (I have a mole on my forearm that no longer has pigment because he's "helped" enough times that all the dark part has been replaced by scar tissue). He also enjoys plucking hair - arm hair, leg hair - whatever he could reach would get yanked.
I modeled my response on what another bird would do in that scenario. They certainly wouldn't stoically tolerate the pain. I "squawk", set him down, and leave the room (fly away) - basically what other folks have already mentioned. I'll let him flock call a while before "timidly" reentering the room (he wants to be around me constantly, so depriving him of my presence is a hefty punishment). My goal is to teach him that I'm delicate and easily spooked, so he has to be gentle if he wants to keep me around. Make the bird tame YOU.
It's worked pretty well and he's much gentler with preening these days. He still goes for scabs sometimes, but he's more careful and gentle, rather than just ripping them off, and the plucking has stopped almost entirely.