So far I'm Rank 4 with this version:
Renolock - Hearthstone Decks
It's a modified Savj list. I'm exclusively playing this list to see how high I can climb.
The differences between our lists are:
You have:
Abusive
Doomsayer
Brewmaster
Earthen Ring
Refreshment Vendor
Siphon Soul
Twisting Nether
I have:
Mortal Coil
Explosive Sheep
Voidwalker
Voidcaller
Bane of Doom
Emperor Thaurissan
Mal'Ganis
Comparing the 7 card differences..
Mortal vs Abusive: I like both options. I might actually take Abusive after seeing your list. Mortal is nice though, especially against aggro decks. Abusive is better when facing control decks. I'll probably stick with Mortal Coil in this current aggro meta.
Doomsayer vs Explosive Sheep: I have fallen in love with Sheep. It's really good and much better than Doomsayer. Doomsayer allows your opponent to react or do more face damage before it triggers, sheep can stop a face deck in their tracks. Drop naked sheep on turn 1/2 and it forces them to think twice before playing Knife Juggler/Minibot. Sheep trades evenly into Minibot too. Sheep also is very strong when combo'd with Demonwrath or Shadowflame. In either case, the initial AoE removes any deathrattles or Divine shields, then the sheep does an addition 2 damage. This can fully clear a ton of annoying shit with ease. Doomsayer is not as versatile. Without AoE freeze spells like Mage I would definitely take sheep.
Brewmaster vs Voidwalker: Renolock lacks taunts. You're probably playing naked brew in most cases. The rare opportunity to brew back reno is not worth it imo. Take the extra taunt imo.
Farseer and Refreshment Vendor are decent but in my list I'll replace Loatheb in exchange for 1 of them if I need more healing. Loatheb is less valuable in an aggro world whereas farseer and refreshment vendor are less valuable in a control world. Sometimes you need to pick a road and stick with it, can't fit them all imo.
Siphon Soul and Twisting nether are both really expensive control cards which I've tried and decided to cut. I am taking Bane of Doom for the extra board presence, but Siphon vs Bane are ok trade-offs. Keep Siphon if you dislike Bane, but you should really consider dropping Twisting Nether for Emperor imo.
Emperor discounts are awesome in this deck. It lets you have stronger combos or even just Jaraxxus+Hero Power same turn. In 1 game I was able to Faceless enemy Ysera+Sylvanas+PoE Sylvanas to steal enemy Ysera = I have 2 Ysera. Normally that would cost 12 mana, instead it cost me 10. And Emperor is always a solid minion to have on board.
Oh and to your point about fatigue decks:
The sooner you recognize you're against a Fatigue deck the better.
Each match is different of course, but you need to know when you can Jaraxxus and Reno. Against Mage you never want to Reno before they do their main burst damage. Against Warrior you should Jaraxxus early if you still have Reno/Healbot to keep you at max health.
Also save the Arcane Golem+Faceless+PoE for that final push.