Why do you soak them in salt water?!
I keep wondering this myself.
One of my primary reasons for wanting to raise my own meat birds is to be able to get chicken that hasn't been contaminated with "tenderizing and flavoring solution" -- which is, at best, selling salt water for the price of meat or, worse, contaminating the meat with a mystery chemical which causes my DH to experience violent intestinal distress.
Doing it to your own meat on purpose always seems strange to me.