Ashby himself states that a lightweight extreme FOC arrow can be just as effective as the heavier arrow even for sizable game with light bows in his Summary. Now take that same FOC arrow and put it thru a 60-70 lb bow and run the numbers.
He doesn't use light weight high FOC arrows. He says "relatively light". That means 600 grains vs 950! By the way, I'm still waiting for your lightweight high FOC arrow specs.
Listen, I could care less if you use a 350 gr or a 700 gr arrow. However, when people try to impart their thoughts on others based on 1 test then I have a problem.
One Test!!??? You've got to be kidding. Ashby has done dozens of tests involving hundreds of shots on animals, and you think your 2 arrow test into foam has any relevancy in comparison?
Even Ashby himself says that more tests need to be done on the type of arrows that some of us use. Yet, that is ignored and it's straight to heavier is better.
You don't read carefully. Ashby is going to test lower draw weights with those lower weight high FOC arrows. He's also going to test lower draw weights with heavy weights to prove his theory, that heavy weight arrows are even more important than high draw weight. He has already tested many light weight, normal FOC arrows and has consistantly found them to have the worst penetration - look at his graphs - plain as day.