We don't know where you are... there's a difference between what you do for cool season grasses vs. South... N. IL has high pH like that...
What kind of soil do you have??? and how does the grass look now??? deep thick roots or living thatch bound roots at the surface???
Now that I know that clay's texture(platelets) has nothing to do with water infiltration, percolation, or drainage,,, I wonder what does...