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They are kinda scrawny, but they still taste just like chicken!
You might process a few at different ages, some at 12 weeks, some at 14, etc., and see what age they turn out the best. That way, if they're getting tough before 20 weeks, you'll know the go ahead and finish the rest before they get tougher, and you'll know for next time.
I know my dual purp roos start to get tough by the time they're 20 weeks old, so I cook 'em in the crock pot, but if I wanted fryers, I'd want to do them younger. They'd be smaller, but more tender. Even a scrawny bird has more meat on it than you'd think. If you end up with a few that are past fryer age, you can always slow roast them in a cooking bag, (275-300F for at least 2-3 hours, until it gets tender) or cook them in the crock pot.
You're breeding leghorns, those roos gotta go somewhere. May as well be your freezer. I'll eat any bird I raise, even if they are little, rather than throw away perfectly good food.
I don't know what the withdrawal period is on medicated feed, I never use it. My chickens do just fine without it, I don't believe in giving drugs to birds that aren't sick.