I've finished the Qitari and don't recall the Ascians being mentioned, though given we get to "chose" their history or at least parts of it, I'm not sure if we'll ever get a definitive Ronkan history now. I guess it's kind of up for interpretation as to weather or not the Ascians were involved with them. Emet said they've done it a lot across the shards, and Ronka is basically Allag of the first, so it makes sense of any power they'd have their hand in that one. Though we also don't know how much they meddle, even if they're not fully controlling it like Allag or the Garlean's, they still could have had a lighter hand in leading it, like they're meddling in Ishguard.