are you use pow relays?
Sorry, I don't understand what you mean, please explain. My #bostr2 is using a mixture of my own relays and the public relays listed here. https://github.com/bitvora/wot-relay
a secondary thing, Relays the accepts pow note base on https://github.com/nostr-protocol/nips/blob/master/13.md (it's not spam free)