KE has always been a major concern of mine,cause I will give up speed for KE.A lot of guys have to have blazing speed to be happy,so they do it with lighter arrow weights.IMHO, I won' t hunt with less than 410grs total weight,and with my LX at 66lbs.I' m getting 272fps.PLenty fast ,with lots of KE......98% passthoughs.My last three bows have been basically set-up this way.....Bob