I've only shot three animals with them and they did what was expected. I didn't take pics of the blood trail, and I don't think that's a significant criterion anyway. We discuss/argue about what's the best broadhead, # blades, # of bevels, etc, etc. The size of the blood trail depends on entrance and exit holes-size and shape, what you cut on the way through, and the animal you are shooting(bear, for example, sometimes don't drop much blood). Where you hit them and whether they move or not before the arrow arrives is most critical. A three or four blade bhd obviously makes a difference on some shots, but you are obviously already settling on a two blade...as I have.
No offense intended - I shoot the head you are considering, and I like it. The Grizzly 160 or 190 are so similar to be equivalent, in my opinion.
The way I read Ashby's reports, the single bevel head is likely to help you most on shots where blood trail is far from the most important factor. If you shoot a deer or elk in the boiler room, it doesn't matter what you use-if it's sharp, you'll soon find the animal. Ashby seemed to be indicating that the advantage to a single bevel would be where it might break through major bone and put down an animal that would otherwise have walked away. In that case, I wouldn't expect a huge blood trail. If you get one, so much the better!
Ashby says his modified grizzlies are shaving sharp. So are my Brown Bears, and the Grizzly 160s, that we have used. That's also the typical criteria with double bevel heads. Shoot heads like that, and into the right spot, and the recovery will be easy.