Congrats on the kill & fine shot placement...
There's just no rhyme or reason to how much of a blood trail you get. I shot a doe a couple years ago exactly as you did your's with a 2 blade Magnus which went 50 yards before going down and the blood trail was enough to give a coroner the dry heaves. Last year in December I filled an extra tag with the same broadhead placed right over the heart, and the deer was down in 20 yards with a blood trail a rookie could have followed. In November I bumped of a 136 & change 5 point with a 3 blade replacable blade that passed through about dead center of the lungs which made it 70 or so yards and hardly left a blood trail at all...
Point being, I don't think it matters a bit if you are using a 2, 3, or 4 blade broadhead, as far as the blood trail goes...