I can tell you for sure that 50 ft lbs is plenty K/E for the rocket steelheads. 50 ft lbs was my K/E last season usin my G/E splitfire 36, shootin 245 fps with ICS 400' rds. I had no problem gettin a complete passthrough on the deer I took, one was at 25 yds. and the steelhead is a tough little head.