You did good! Mixture is a little different than I usually use.
I use 0.5 %- 6.4 (6 1/2 I'm lazy and not exact) ounces to a gallon of water on my birds. I either spray vent, under wings and neck OR
I'm lazy and
It's hot here-i use a bucket and dip entire bird (up to neck), turn em loose in run...