Well first congrats on the kill. Second, All I can tell you is that 2 blade heads tend to yield more sparse blood trails. And in general blood trails are very unpredictable and highly variable things. Shot a doe from a tree stand once with a 4 blade muzzy at 18 yards. Nailed her tight behind the shoulder with a low exit wound on the offside. No excuse for there not to be a good blood trail. But from where my arrow was buried in the dirt to to the spot I found her 70 yards away I could not find one single speck of blood. No rhyme or reason to it sometimes.