So the way I am interpreting this is that because the shafts are lighter then the standard broadhead weights will give you a greater front of center percentage thus, theoretically increasing accuracy. I do not know if I entirely agree with that because a misaligned insert, nock or broadhead is still going to cause an arrow to plane regardless of the front of center balance, fletching style or configuration.
I'll second that , dont think all the hype about foc and broadheads as important as most make it out to be . There are other much more important factors , ie straitness , spine , nocks and broadheads on strait , and adiquate fletching [ my petpeve ]