Nice! Haven’t really had the time to play as much, so haven’t reach beyond rank 9.
Your deck and mine are more or less 73% similar, yours seem to be more of a control deck.
One thing I noticed about your deck is that is has 11 Spells!! I’ve been through that, and felt I could use lesser spells and more minions. There were literally a few games in a row where I’ll just be getting spells after mulligans, and the minions drawed later weren’t helpful if they are high on mana. I felt it would lose a lot to tempo/agro decks (haha, what to do with 2 SWD on hand without coin when faced with Face Hunter? That game ended quite badly). 2 Valens is a bit too much as well I felt, remember drawing a technician and 2 Valens without coin, couldn’t really start playing until turn 3 (some more without dragon on hand), and by the time you buff the minion, he had board control/ or you are on low health. That’s why I stick with minimum 8 spells. Notice you don’t have entomb? It’s a rather useful spell I must say! In fact if it wasn’t for the 6 mana, I would have swapped my other SWD for another entomb. It feels good to finally be able to win a Control Warrior

About
Chillmaw, yes it has helped me win quite a lot of games, especially when I have a bad starting hand, or bad draws. He is there to avoid face damage/board control from opponent. He is helpful too if you can’t seem to draw any Holy Nova/ Light Bomb even when you have 10 cards left!! Nefarian is alright, I tried him before I had Chillmaw, but I feel he can’t really save you especially when you are on the losing end or being rushed/aggro’ed. And I seem to have received more useless opponent class cards compared to those I can really use.
As for
Vol’jin, he’s also useful to remove taunts particularly, or some legendary you do not want on board. Although I do not have smite, Nova works as well, or any other minion could easily to 2 damage. Usually by the time Vol’jin comes out, you would more or less have board Control, he’s more or a late game minion, usually used on Ysera or those that can’t be SWD’ed.
As for
Shrink/Cabal combos, I’m more or less done with that, this couple does not like each other

they would very seldom appear in my hands together, especially when I need them the most. So I’ve dropped them for other 3 drops like Dark Cultist and Eydis (which combos nicely with PWS and Valens). Eydis is also a good taunt, as opponent assumes you either have PWS or Valens on hand (which I sometimes don’t), and tries to kill off Eydis.
Brann – I like this guy, but have to be real careful with him being stolen. What can I say, I have 13 minions with battlecries

Initially put him in for fun, but fun seems to be working well.
Justicar – 4 heals! This is especially good recovering from agro/tempo decks. There were many times where opponent brings me down to very low health, but just can’t finish it off. The 4 heals provides a good chance for recovery and turn the table around. This is also very good against Control Warriors. Fatigue is real bad, 4 heal helps you to sustain well throughout. Won a few control warrior matches with this. I also used to have Auchenai in the deck, that’s 4 damages! But the synergy is just not there.
what's your Battletag? i would add u in game.
I haven't gotten my third wing for LOE yet so i do not have Entomb yet.