The only problem that I have with 2 blade heads comes from one event. I shot a nice buck at 12 yards with a Grizzly 2 blade...perfectly center mass through both lungs. The only blood was some blood spray at the shot sight. I watched the buck run off, stop at 45 yards, cough and ran for another 55 yards, flipped and dropped dead. The broadhead spit through him like a hot knife through hot butter. However, there was NO blood anywhere...other than the spray at the shot sight.
This turned me off of 2 blade broadheads, due to the lack of a blood trail. Since this event, I have shot 3 or 4 blade cut-on-contact broadheads and the blood trails have always produced great results.
Just the same, I've heard from other bowhunters that have had excellent blood trails from various designs in 2 blade broadheads. Now, I'm curious if what happened to me was an isolated incident.
I appreciate the explanation of "balance" between width and length, for the application of the animal being hunted.
Bowhunter57