Hope these help.
I've also been thinking of getting back to Doomsday again. We'll see.
Personally, the more I tweaked Doomsday the more I leaned towards Ad Nauseam Tendrils or Burning Oath. Even then I found DPS to be better suited to contend with Top tier decks atm. Even my EDH Doomsday deck leans on Ad Nauseam first.
Just some thoughts.