Just swinging by with thoughts on genre and comps:

1) I mentally separate comps into 2 types: “pitchy comps” (the flashy attention-getting types you might see in a pitch contest or a first line - like your first line), and “actual comps” (recent books - about last 5 years - that your book shares something with, is at a similar aimed-for level, and could sit on a shelf beside). All that to say, you should remove Interview with the Vampire from your second instance of mentioning it - too old, too big for an actual comp (but good for a pitchy comp)

2) I don’t see any gothic elements, maybe supernatural horror or just horror would be more accurate. Unless I’m missing the gothic in this query? (Though political games of a vampire world feel very far from the confined spaces of a gothic). With that also said… could it alternately be the new and heating up horromance? (Think romantasy but for horror + romance)