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Its been a while since I shot, and posted over here.. but, its the diameter of the arrow that was giving you your penetration. For the same arrow weight having a shaft that is the same diameter as the broadhead provides a friction bearing surface that goes the length of the arrow. the skinny bemans have the same diameter head as a normal broad head (I think) but the shaft is smaller in diameter than the arrow head. The head provides the larger tunnel for the arrow to simply pass through.
