Any recommendations for hard/insane wave focused demons that aren't nine circles levels?

I have been trying to improve at the wave since it is one of my weaker gamemodes. I've beaten a few hard demon NC levels recently and they've been fine, but they tend to be too hard on my eyes and make the game less enjoyable during longer sessions.

So if anyone knows any other demons with challenging wave gameplay in the hard/insane (or even beginner extreme) range I'd appreciate some recs!