@Enzat Some thoughts, as I'm looking at your build. I understand this is primarily a farming build, so the emphasis on a bit more damage (Experimentation) and protection (Fighting). I personally think you could do without Fighting Pool, as with all the -ToHit you throw around (the most in the game, actually), you'll be essentially beyond cap.
The thing that stands out to me is the need for you to take Soul Extraction. This is your mule for all 6 Mastermind pet IOs, leaving you free to add procs and stuff to beef up your pet damage and DEF/RES. My suggestion is to lose Fighting, take the slots from Tough/Weave and one slot from Spring, and 6-slot Soul Extraction with the IOs.
Feel free to pick up two one-slot wonder powers, such as Power Boost (or Vengeance/Victory Rush) and Super Speed (or Speed of Sound). Vengeance can take a LOTG +recharge, so there's that.
I never have any trouble with my MM endurance (or any of my characters), and I avoid shoring up endurance with Incarnate abilities out of personal preference. I fix it before 50, myself. Lots of 2-power +recovery invention bonuses to collect. You may wish to more judiciously watch how often you use Experimentation if the blue bar woes are in action. With the IOs in Health and Stamina, that really should have you good enough to spam Twlight Grasp and use your other Dark Miasma powers in rotation off cooldown without issues, plus your leadership toggles/Mace Mastery.
More later, just wanted to post some thoughts.