I have a HUGE problem. I live in central Louisiana and am having a hard time finding a feed store with the correct amount of protein. I have read at several different websites that raise call ducks and their feed program calls for 18- 20% starter non medicated (which I have access to that) but, then when they are 3 weeks old they switch them to a 16% grower. The feed stores around here carry 18% grower, do you think that will make that much of a difference? I have read where too much protein will cause deformities. Any advice?