1) I don't think
Rough is great in Delver mirrors. I would rather have more CC1 removal.
2) Not really scared of True-Name. It's not trivial to resolve and really only acts as a removal spell on one of our ground creatures most of the time.
3) I don't think you need
Sulfur Elemental against Miracles, but it likely has merit Death & Taxes. I have barely played the matchup though, thus I'm not sure if it's actually needed.
4)
Spite of Mogis is a card I was not aware of. It's definitely a cool card and I'm going to try it out at some point. Disadvantages compared to the other two are inconsistency and, ironically, CC1. I think I like spreading out my removal a bit to get through Chalice and
Sanctum Prelate.
5) It very rarely happens that I get flooded on Revelers. Spefically, it rarely happens that I have to discard one of them to another's trigger. More often I end up chaining them through cantrip-sequencing (activate your fetchlands before you cast your pre-Reveler cantrips). Further, I think Reveler is just your best card to draw in many matchups (best creature against Miracles for sure, best card vs. most
Abrupt Decay decks). I don't really like
Young Pyromancer in this deck. I can see the merit of
Snapcaster Mage, but I haven't traditionally been a fan of him in Delver decks.