This is the right question. "Nothing was wrong… but nothing was obvious either" — that's the exact moment design shifts from decoration to communication.
I just went through this same process rebuilding the UI for VEXR Ultra and Sovereign Forge. The first version worked. The colors were fine. The layout was clean. But stepping back as a user, the message wasn't hitting instantly either.
The fix wasn't adding more — it was refining what was already there. The hierarchy got sharper. The contrast got intentional. The visual tone shifted from "functional" to "sovereign." Same content. Completely different feeling.
Your point about clarity building trust faster than aesthetics is spot on. Users don't need to be impressed. They need to understand what they're looking at in the first three seconds.
Good design makes the user feel smart. Great design makes them forget the interface exists entirely. Sounds like you're chasing the second one. Keep going.