I know that the computer programs love to rccomend really stiff arrows, and I cannot argue with the arrows showing a weak reaction, but IME with the 09 & 08 Center Pivots, they like a little bit weaker spine than you would think. My Commander likes a 400 spine (28.5/72 pounds) and the Admiral liked a touch soft as well. Both of these setups tuned easy peasy with the LD, running centershot straight down the middle of the grip, leveling the bow, rest , then nock point with the arrow in question.
Also make sure your LD cord is fairly stiff at tension and the LD attachment is as close to the cam as you can get it. On some bows It's a very fine line between the cord being too lax, and too tight.