I'm confused from your post. Are you a couple looking for a single girl to date the two of you? If so are you expecting her to not date others as well?
Those could be part of your problem. I don't know what you mean about not finding romantic polyamory because the amory part of the word does stand for love which generally includes romance.
I think more information needs to be provided in order to actually help you out.
Woodsmith: My husband
Merry: Tig's wife/slave
NT: Merry's boyfriend/owner
Elle: NT and Merry girlfriend
Umbra: Elle's Dom
Pet: Umbra's slave/wife, Elle girlfriend
Domo: Pet's submissive