for what it's worth, Home Depot rents mechanical aerators for $62/day. I'm picking one up on Saturday and splitting the cost with a buddy. This aerator actually removes the dirt clumps and brings them to the top of the surface.
I assume I'm going to have to be careful with this thing around the sprinkler heads.
As far as the corn gluten, it does have fertilizing characteristics, but you should put it down now if you haven't done so already. Use a fertilizer like Ladybug in April/May. Now that I've been using corn gluten for about a year and a half, I can already tell a major difference in the amount of weeds in my lawn right now versus some of the neighbors.