That was me
I feel like a 2nd Azure Drake is a better replacement for Hammer of Twilight. I've never really been convinced by Doomhammer in midrange decks. The main focus of this deck is board control, which I don't think Doomhammer does particularly well.
I liked having Defender of Argus instead of the 2nd Tuskarr. I used to always have 2 Arguses in Midrange Shaman. It has a lot more competition now with Flamewreathed Faceless and Master of Evo, but I still think it warrants a spot. Partly because it's important to get value out of your hero power. Sometimes with Shaman, your hero power does nothing and each time that happens, you've wasted 2 mana. I guess another option would be a 2nd Flametongue, which also does what I'm talking about and helps with the totem synergy as well.
Of course, if you disagree and your adjustments are working for you, and you're happy with how thing are going, just ignore what I've said.
Also Earth Shock is taking up the tech slot so, depending on the meta, adjust if necessary. It's a good answer for Darkshire Councilman and Paladin buffs. But if you're seeing a lot of C'thun decks, the Black Knight is insane.
I'm glad a few people have had success with the list. Have fun ladder climbing