I use the max burn fusion grenades when I run Sunsinger in PvP. I get two of these epic grenades with the Starfire Protocol chest armor, and each one is a guaranteed kill if stuck. I've made some great sticks from long-long distance (sticking snipers mostly) (church courtyard to B on Widow's Court). They stick even if you bank shot the grenade off the side of the building. Max burn firebolts used to be my fav in early-mid year-one, but the DoT was nerfed to a point that its hardly worth it now. Don't use em anymore.