Play with the 3Rivers calculator. It's extremely helpful, especially if you already have a setup that is already tuned. Once you know the dynamic spine you need, you can build new arrows to the specs you want. Dealing with brand-name carbons really makes it easy.
For whitetails <15 yards away, I think it would be hard to screw it up. I don't know how much you want to overthink it. I'm a fan of Ashby's work. But all in context. No disrespect to Ashby but the time-tested advice of a well-tuned, sturdy arrow, 8-10 gr per pound, 2 blade COC broadhead has much more real-world research behind it than one man could ever hope to gather. You can adapt Ashby to that model by increasing FOC, going for 3:1 heads, etc. but I think it's mostly just preference to make us feel better. Yes, a 300 WinMag will take down a whitetail and is a very powerful and effective round. But so will a 30-30. And at whitetail ranges, how much do you want to worry about it?