I agree that diameter most likely has an effect. I was just trying to find if there was any hard evidence of it.
Doesn't mean I wouldn't still poke a hog with a 2315 or a 23/64ths cedar though. They've been doing great for me for a lot of years.
I know what you mean. I'm totally convinced on the benefits of extreme FOC arrows, yet I'm going to be shooting some 2018s with only 125 gr on the tip, out of my longbow this fall. 560 grains that flys straight, will still do the job on a deer. I have the arrows and they are too weak for a heavier head, but they have plenty of deer shooting left in them.