I finally got around to testing this last night. I pretty much only pvp as survival but I have done some mythics too. On dummy at 472 ilvl in survival pvp gear i ran consistant 60k damage. I sim 78kish. I really liked how this refreshed serpent really well. I think its an issue with keeping bomb going. There was always a charge availiable. Did well with kill command.
I did add disengage and harpoon on shift modifier to help with focus.
I added harpoon, ancsstral call, and coordinated assualt in pre macro.
Understand that I many just pvp with survival so obtaining highest burst at first part of fight is my biggest challenge.