American mild is an oxymoron! That's just not how 'merica does things!...
You mean "that's not how 'merica overdoes
Seriously though, I think the recipe looks great (it's actually quite similar to a brew I do once in a while).
I really wouldn't change any of the ingredients or ratios. I agree that it would
probably be better though with a yeast other than S-05.
If you're using dry yeast, I'd be more inclined towards something like S-04.
It'll still be an "American Mild" because you made it in America.