I want to create this deck because I have a love for dark confident and red and would like a viable deck where they can be played together

. Here the list i've been working on so far but its a little weird.
Creatures-17
4 Dark Confidant
4 Grim Lavamancers
3 Gorilla Shamans
4 Goblin welders
2 Viashino heretic
Sorceries and instants-17
4 Duress
2 Cabal therapies
2 Dark Blast
3 Shatering sprees
2 REBs
2 Pyro blast
1 Vampiric Tutor
1 Demonic Tutor
Enchantments and artifacts -5
2 Blood Moons
3 null rods
MANA - 21
1 Mox Jet
1 Mox Ruby
1 Lotus
4 Bloodstained mires
4 Badlands
3 Mountains
2 Swamp
4 Wastelands
1 Strip mine
First about the deck i would like some imput as to the choices.
Should Mox Monkey be goblin vandals?
Should Goblin welder even be in this deck?
Should Grim labamancer be mogg fanatics?
Is it worth it to try to fit in withered wretch?
THe following is an analysis of the decks in my meta.
Matches
Gifts- Matchup ok
Maindeck REBS and duress probably go a long way as well as null rods/ blood moons. Maybe i should consider tormods crypt altough it is not functional with my null rods :S(anyone got better graveyard removal that isnt double black). Heritic is and rebs is my only answers to tinker collosus.

In the board may include more REB. (maybe some diabolic edict?)
Stax - Matchup good
I have a ton of artifact removal but its all slow discounting the shatering sprees. Also Mox Moneky only deals with small artifacts in this match up is it worth a few vandels to deal with bigger artifacts. I also have 6 answers to welder but one of them is slow(4 Lavamancers) would i benifit from fanatics instead? Blood Moon helps vs crucible. Need shatering sprees in the board so i dont lose to chalice for 1.
Slaver- Matchup good
I am not at too much risk with 7/10 but also i can deal with alot of their stuff in the form of mox monkey-darkblast-lavamancers + fast beaters. I fear trike so i need to resolve a null rod early.(also works good vs the majority of this deck hehe). In the board may include more REB.
IT- Matchup ok
Duress helps and so does REBs and null rods. But is it all too little probably too late? pyrostatic pillars in the board should help alot. Also so should the additional REBs as i dont imagine they would board into confidant. Need to find a way to deal with graveyard recursion!
Angel Oath- Matchup bad
need to stop them from resolving the oath, which is imposible unless i get some lucky duresses. In the board for a deck that is R/B there is not many options anyone got some ideas?
Fish - Matchup ok to bad
Fish isnt very vulnerable to my artifact hate think ill have alot of trouble. REB/pyros to be mvp but it may be too little.