Hello all and thanks for the advice
Adding another color would be tactically sound, I know. But the entire premise of this deck is the fact that it is mono black so taking another color on is out of the question.
Running 4 Dark Confidant I would not want to take in 4 Nights Whisper as well. But I agree that the deck needs to flow even better.
I would sooner cut Hypnotic Spectre than I would cut Mishra's Factory. The latter passes Dark Confidant for 0. But perhaps both of these creatures' time is up.
Negators are pretty bad in my reddish meta

Cutting the tutors is fine. Demonic Consulatation gets to stay, though. After all, you get your stuff at once, and it is only B.
Heeding most of the advice, how about this build:
///CREATURES: 16
4 Dark Confidant
4 Dauthi Slayer
3 Nantuko Shade
3 Braids, Cabal Minion
2 Masticore
///OWNAGE: 17
4 Duress
4 Hymn to Tourach
R Mind Twist
4 Sinkhole
3 Wasteland
R Strip Mine
///ODDS & ENDS: 7
3 Mask of Memory
2 Chainer's Edict
R Demonic Consultation
R Yawgmoth's Will
///MANA: 20
4 Dark Ritual
R Mox Jet
R Black Lotus
R Lotus Petal
2 Polluted Delta
2 Bloodstained Mire
9 Swamp