Maybe it depends on where your notes originate from?

I primarily use Damus, so perhaps the client sends to that relay first?

No idea honestly.  I’m still using Damus client and relay, and spam is gone (for now) 

 I meant Damus relay btw. I use Damus client 

 I meant Damus relay btw. I use Damus client nostr.fmt.wiz.biz