Interesting questions. How much aeration is enough? How much is too much? How deep should you go? 2 inches? One-inch? Half-inch?
I see the problem as, after you plant the seed...in an experiment...how do you tell which part is new grass--and which is old grass?
Perhaps a test could be simplified by running the test on bare soil. Compare different depths and different numbers of holes per sq foot. Simple to do...just count out 1000 seeds per square foot. And have at it.