Bow tune will likely affect penetration as well. I never tuned my bow since the mechanicals fly and hit in the same spot as the field points. It's entirely possible that my arrows were skewed considerably less than perpendicular to the deer on impact. A lot of arrow energy is then expended bringing the arrow in line as it passes into the deer. Also the angle of cut is driven slightly sideways instead of just straight thru. When I made the change back to fixed I had to do considerable adjustment to my rest to get the point of impact of the fixed heads the same as the field points.But I've had largely different results. I wonder if the 1.5" heads are the difference? But I was getting through with the 2" blades as well.
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