I disagree! Arrow weight has more effect on changing KE than speed does. I currently shoot a 350 grain arrow at 307fps giving me a KE of 73#. If I increase the arrow weight to 450 grains which will drop the speed to about 285fps, but the KE increase to 83#. Go to
www.bowjackson and run some models on the KE computer it will confirm what I am saying.
Aim Hard!