You also have to know how to arrive at proper spine when using heaving weight on the front.
I'd really like to experiment with light arrow shafts and ultra high FOC's but that right there is what keeps me from it. My arrows are too long (32"). Even at 125 grains, the charts show me needing a shaft with .300 spine deflection. That's pretty much as stiff as it gets with carbon. At least, so far as I'm aware.
Maybe I just need to break down and find myself an overdraw so I can shorten up my arrows.