Looking forward to hearing how your deck does with all the recent iterations of changes.
If you're getting beatdown by double Delver, you probably want
Snapcaster Mage because your best out is double Plow.
When I recently brewed UWx control with enchantments, I went a very different route with CB RipField, which is a prison strategy instead of an incremental value engine. That has very different implications for how you play around threats. The response to double Delver was to EOT cantrip/ETutor into Energy Field, with or without RiP. That 1 card then nullifies the double Delver and any other threats in hand for at least several turns, creating time to find RiP or Terminus to take back the game. DSphere was another option for 2 threats of the same name. Needing to only resolve 1 card to stabilize really simplifies card selection decisions and playing around counters. Traditional UWx control has
Terminus as that reset button. Here, you don't really have a single out. You need to assemble an engine or draw into multiple removal effects. That makes it inherently harder to stabilize from behind, something that control needs to do against fast decks. Tweaking the numbers as above may help this.
Why did you cut
Terminus? No
Dead of Winter either? You're a 0-creature deck so what's the downside? I think all the Yorion decks from the Companion era ran either Terminus or Dead.