I have found that Wally doesn't do well on Turkey necks, always comes back up on him. But chicken quarters and bison tails haven't given him any issues at all. So maybe Knuckles just isn't a chicken boy. See if you can find duck or rabbit for a decent price, or try Turkey perhaps.
"All changes, even the most longed for, have their melancholy; for what we leave behind us is a part of ourselves; we must die to one life before we can enter another." -Anatole France