Andy,
Did you have any dislocated wing joints?
There is discussion at the Yahoo group "Whizbang Pluckers" that its either caused at the kill from flapping or during plucking because of the "feather gap".

I notice that my way of killing (hanging upside down by wire and slicing neck) doesn't constrain enough, and that's when my dislocations happen. About 35% of the time this year.

My home made plucker does have uneven gap, and sometimes a wing/head/leg gets caught, and depending on scald time/temp skin can rip, but I don't think its causing dislocations.

Great work, man!

re: blood. There is discussion among the farmers I'm working with over here that both the blood and feathers could/should be turned into meal. We think it could be dried on big metal sheets, if the sun ever comes out again. And the feathers could be baked then ground too.

Got any good recipes for the organs? I've stewed gizzards and made pate, but I'm looking for what to do with POUNDS of offal.

Freeze it? Can it?