I took a couple more shots at Levi just to test where I'd be lacking (can get to about 50% currently). Unlike Titan, Phase 1 is the most dangerous. Noctis might not cut it in this fight. May have to go back to Aranea or Sora (Sora probably being the better option tbh).
Either way, I'm going to need to pick up Lightning's Glint or Glint+ for the EnLightning before I'm going to make another serious attempt.