Somebody had a visual diagram of the difference between intel and amd chips. Ones concave and the other is convex. I believe that would effect tim application as well. ie using more or less based on the chip being used. Its also a slight misconception on the actual spread of our tims on said parts, cpu or gpu. We may not get the same results due to us not being able to apply as much pressure as you did on the two pieces of glass, or not knowing how much is enough to get spread. Sure, you could try the pea method, put your parts together, run it a few days, then pull it back off to check spread then reapply.
You would have figured somebody would have tested which amount is close to perfect without having excess, then just sell that exact amount per chip, cpu or gpu respectively