Yeah, my hengelis are narrow bodied compared to the espei, more silvery, less colourful too. My lfs only has hengelis unfortunately, but grown to love them. Espei are lovely though, red sides stand out. Yours look exceptional.
Bottle traps set for shrimp seem to be effective in catching Otto's from what i have read. Some veg or Algae waffer in the bottom, lights out and fingers crossed you may catch an otto if not all in the morning?