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Considering the age of your birds you may want to consider this from Storey's Guide to Raising Chickens, "A picking machine has rotating rubber fingers that rapidly flail feathers off, which sounds nifty until you learn that a University of Arkansas study found mechanically picked...
When I process I only slit their throats and then debrain (sticking the knife into the back of the throat and giving it a quarter turn)them. The debraining makes it easier to dry pluck. I always start with the wings because as the bird cools it gets harder and harder to do those big feathers...