Matt, I guess I wasn' t clear in my post. As is shown, the Patriot shot the heavier arrow 10 fps faster than the P38. The P38 was even with the lighter arrow. To me the Patriot would seem more efficient, as it was faster with the heavy arrow. The birth certs with the two bows showed:
Patriot at 61.1#, 29" , 300 gr arrow = 320
P38 DC at 61#, 28" , 300 gr arrow = 308 (318 at 29" )
Both are very close with the lighter arrow. The Patriot Dually however retains more speed as the arrow gets heavier.