You guys are over thinking things...
Ea40 is probably the most forgiving epoxy out there it’s really hard to screw it up. I know bowyers that do everything from 50/50 by weight , 50/50 by volume, 2-1 by volume, and 2-1 by weight and just about everything in between. And every one of them are successful bowyers with astounding reputations!
I personally do 2-1by weight and have never had a glue de-lamination. I do 2-1 just for a higher HDT..
the biggest mistake people make IMO is not mixing properly or using old glue. I designed a tool that I chuck in a drill to mix with. I then place it in a container of acetone until the next glue up. I also transfer to a clean cup after mixing to ensure I don’t have any unmixed glue somewhere. Just in case!!