I'm planning on doing a similar thing by myself with my LG and Hovabator, but with shipped eggs. I was thinking about your post, and you had mentioned the egg differences between your eggs and his. Although since you live in different places the handling of the eggs would still be a factor, you could order hatching eggs from the same source and set them together.( In my case the two test set would have traveled together with the same postal treatment.) Then you can apply your incubating techniques to those and see who has the best results. So then the only big issue may be do you both want the same breed of hatching eggs (which the same breed and hatching, from the same source would be a factor that could eliminate several variables), or if you want to get less expensive eggs would those be breeds you wanted or could sell off? I was also considering getting eggs from far away as well as closer to see how much of a difference that makes.
However, All of my own eggs I have set this year have been pullet eggs. I have had 96% and then 100% hatch rate with them. Unless you have a difficult to hatch breed, I don't think the pullet eggs would be an issue as far as being young birds. I almost did not set any because I had read post that said do not set pullet eggs. I am vary please with my hatch so far and I have some what appears to be very nice birds once they get all grown out. AND they all hatched in my LG!!
I do think it would be a fun experiment and would like to see how it goes. PS I am not trying to take the fun out of it, I had just been thinking of something similar myself and when you mentioned variables, thought I would throw in my 2 cents worth. However, my option would not be free.