I am below average at PvP but regularly get 3-5 kills per Fist of Havoc Super in 6v6. The secret is just to get kills by jumping and slamming down, I do not shoulder charge with it at all because it uses too much energy per kill. So big jump at the start, then activate Fist of Havoc to come down and get first 2 kills with that first landing. Then there is enough energy left for another few strategic jumps using the radar. Definitely got a 5 kill with it recently