I haven't considered Doomsday as an option yet, but I can get behind it. What are the advantages/disadvantages to playing Doomsday as opposed to not?

Hello everyone, long time reader/first time poster here. I have been playing Vintage online since we acquired our full set of power, and I have mostly been trying out variations of Gush Tendrils. I briefly switched to Gitaxian Long for a bit, but found it to be less resilient, and since there are alot of control decks in the daily events online, I figured Gush was a better place to be. I tried a version with Mystic Remora and more counterspells, but found that diluted the deck quite a bit as far as being able to go off on fewer resources. So after a little research, I found a list on mtgtop8 from January of this year that had what I wanted: Gush and Dark Ritual. After playing with Ritual for a bit, it not only made going off more consistent, but allowed me to be able to go off on fewer resources. After some tweaking, this is where I am currently at:

3 Underground Sea
3 Tropical Island
4 Misty Rainforest
2 Scalding Tarn
1 Island
1 Snow-Covered Island

1 Black Lotus
1 Lotus Petal
1 Mana Crypt
5 Moxen
1 Memory Jar
1 Blightsteel Colossus

1 Ancestral Recall
1 Brainstorm
1 Chain of Vapor
1 Mystical Tutor
4 Dark Ritual
1 Vampiric Tutor
1 Rebuild/Hurkyl's Recall
1 Gifts Ungiven
4 Gush
4 Force of Will

1 Ponder
3 Preordain
1 Thoughtseize/Duress
1 Merchant Scroll
1 Time Walk
1 Demonic Tutor
2 Regrowth
1 Timetwister
1 Tinker
1 Yawgmoth's Will
1 Tendrils of Agony
1 Mind's Desire

1 Necropotence
1 Fastbond

SB:
3 Energy Flux
1 Rebuild
2 Nature's Claim
1 Forest
2 Tormod's Crypt
3 Ravenous Trap
1 Flusterstorm
1 Duress
1 Dismember

I'm still not sold on Energy Flux being the card I want against Shops, it's already kind of slow at 3 mana, and it usually costs 4 or 5 mana, and I just don't think you have that kind of time in the matchup. Maybe Trygon is where I want to be, every time i've had it post board against them it feels like they can't ever beat it. 5 cards might seem like alot for Dredge in a Tendrils deck, but you sometimes need a bit more setup than TPS or the Long decks, so I just like having more cushion against them. The Blightsteel has been superb for me, and I would never think of moving it to the SB. I have yet to Tinker for Jar, so i'm not actually sure if it's good or not, but it doesn't take up a ton of space and I can see certain situations where I want access to it. I've been looking for ways to shore up the control matchup post board, and it seems like I would have to cut down on the Shop/Dredge hate to make room for more Duresses, I could also see cutting the random Dismember, as it has rarely come up.