Your changes dosen't make it scary in the slightest, I'd much rather have them the way they are now, only spawning one makes them rare, but still not scary, and having them follow me, well I coulnd't care less, if they avoid water and light, I can just stay away from darkness and throw down some torches and I'd be safe.
Generally all oyur changes make them seem more like a creepy old man, following me around, but they'll almost never attack me, so I won't be scared in the slightest. Just keep them like they are now.