I'm red/green colourblind, so I don't really follow blood trails. Besides being almost impossible, I find I rarely need to. I've been lucky with my hunting and I also haven't killed anything with a bow larger than a mature boar pig or a big fallow buck or billy goat, so maybe if I ever kill a red stag, elk, or water buffalo, it might take longer for something to lose enough blood to die.
But honestly, my point is that for me, blood trails mean nothing, so I just go with what flies well and what I can get super sharp. I've killed plenty of critters with the Terra Firma Venators and Gladius so far, and have friends who have killed far more than their fair share as well, and it's rare that we ever have to follow up something that died out of sight.