Ok, so i was just looking over the new assassination pve spec with Lightning Reflexes. Then that gave me the idea to drop hfb and 3 points out of cttc and get imp snd and blade flurry and put the extra point in relentless strikes. now i know dropping hfb would be a massive dps loss but could blade flurry make up for that with possibly doing massive envenom crits on 2 mobs? and the extra poison procs from the 20% increased attack speed?
Could maybe work on short fights with more then 1 mob, This is just a idea nothing serious.