Yea, I'm aware of the 2lbs N per year recommendation on Zoysia and I totally agree with you on the wait for first fertility even though I run it a month or so ahead of you (remember,I am south of you) However, I do not hit them with a full pound of N per app. I apply 1/2 pound of N per app. Hitting them with anything over 3/4 pound N in one app has always caused problems for me. In the grand scheme of things my fungicide expense for disease issues in turf is pretty negligible when compared to Gross Revenue. I really think it has a lot to do with my approach to fertility in zoysia, which is more prone to disease in our area.
"The Poor Fish" circa 1930's: The Poor Fish wouldn't have been caught if he'd known enough to keep his fool mouth shut.