Well the biggest thing is you applied it in July. The best time to apply is do an application in the fall then do 2 more in the spring. 2-4d and dicamba don’t kill grass only broadleaf. That said if I were you, I would spray glyphosate around 2pints an acre then plow it over in 2-4days. Then wait for any kind of regrowth and spray glyphosate with 24d or dicamba because you’ll probably have broadleaf pop up as well. That way you damage the grass and destroy the rootsystem and will not allow for recovery.