i am also interested in this topic because the only formula that i have found for KE is

arrow speed (squared) X arrow weight
divided by 450240

and buy the lookes of the formula the greatest boost in KE would be the arrow speed. if someone can shed some light on this subject it would be greatly appreciated i am planning on overhauling my bow setup after the season to get as much speed as possible. the problem is that it is going to hurt getting rid of my faithfull 2315 superslams.