Lynx I suspect it was your feed. They really need to be on game bird ration not chicken feed. Having access to chicken feed they will take it, and it's not enough for them. I did get away with giving my layers the game bird ration one year, but that expensive way of doing business if you have lots of chickens.
As for blackhead worm your chickens in the winter when the laying is down anyway, Safeguard is a good one to get rid of the worm that brings blackhead to your turkeys. If you let your turkeys free range they still might get it as earth worms can be a carrier of the same worm.
As for them getting tough Nadams4 the whites will not, they just can't be bothered doing much. The BBB will so they need to be penned, and good luck, wing clipping is a big deal, they could fly over my barn no problem!