I turned frequency down to 1, but I still see tons of them, sometimes two or three nearby each other.

Hmm strange. Will take a look. Thanks for the report

I've been chopping up the ones dealing in bunny slaughter and with Pillagers they've made a fairly consistent emerald source. >:)

It does seem to be the case. I've had two of them in my small house with another right outside. They show up almost annoyingly often.

I have pillagers installed, but I've yet to get anything from them.

Will be fixed with new spawning logic next update