Keep using Murderous Efficiency. Frozen pulse is sh.t when you use gathering storm and BoS. Keep Seal + koltira, they're like BiS legendary for BoS. Don't use KJBW.
I'm a noob when it comes to analyze logs but... What I don't understand is that your Obliterate is your first source of damage. When I compare with the others DKs, their main source of damage are either BoS or HB. Maybe that's because you have 3 obliterate relics (btw they sucks. Even in single target 865 Blast Radius Relics are worth 890 Ambidextry relics (source : https://docs.google.com/spreadsheets...#gid=594475001 )) ? I don't know, it's weird. Also their frost strike only represents 5% of their dps while yours is twice the amount !
Do you use rimes before obliterate or frost strike ? It should be your first priority.
In fights like Krosus I noticed that while you got belt + seal, you still did WAY less damage than when you had the KJBW trinket instead of belt. That's not supposed to happen. That's most likely because of Frozen Pulse's talent + poor uptime of BoS.