Yeah that was me! I changed in those chants right before the tournament from Mental Missteps which hadn't been doing work. Having a turn 1 play when you don't have acceleration to get to impactful 2-drops seemed nice. It also is pretty funny in response to outcome or will.
You are right about the softness to shops, I don't know how to solve that problem other than to totally rethink the sideboard, I don't think 1-for-1s is the answer but I am not entirely sure what a good answer is, any thoughts would be welcome.
Oh I also realized late that this sideboard is off by a card I had -1 Kataki +1 Sanctum prelate, cause I couldn't find my 3rd kataki before the tournament, I found the prelate to be good.
Yeah that were my thoughts as well. It acts like a pseudo Time Walk allowing you to play less acceleration (although I see you played all the moxen anyway - did you ever find that between 5 moxen and 4 Deathrite you were playing too much acceleration?). What I also like is that it seems decent against Shops as well, and the kicker shouldn't be underestimated in that matchup.
I've found the Shops matchup to be hard no matter what you do, but I agree that 1-for-1's aren't enough - but it's needed anyway. Currently my anti-Shops plan is 2 Kataki (main deck), 4 Swords (2 main, 2 board), 2 Nature's Claim, 1 Devout Witness (just something I'm trying out at the moment) and 4 Serenity (along with 2 Thalia 2.0 and 3 Wastelands main deck).
Serenity is very good and can get you out of situations no other cards can, but it still needs some other cards alongside it. Thalia 2.0 isn't very good vs PO but it still has some value, and I've found it to be one of the few cards that's good in almost all matchups (it's great vs Dredge, BUG and Landstill for instance), and it's really good vs Shops - especially with a Stony Silence in play. I think you want to play something like 10 sideboard cards to bring in against Shops.
If you were to go that route, I'd recommend cutting the Revokers. I do like Revoker for it's versatility and as a solution to Jace (which is hugely problematic for a deck like this), but Jace isn't played that much currently.
Sanctum Prelate is one of my pet cards, and I think it's very underrated, but it's also a bit slow vs Paradoxical Outcome.