[@Legion02] There isn't much history for me to cover, but would it be alright if your nation had an Ashtari Cult/Sect by the time of the war?(They possibly would've engaged in terrorism and all that during the war), could also explain the number of human psonics within the Ascendancy. 

And depending if relations havnen't soured from the acts of said sect, there would possibly still be a small amount Ashtari faithful within your nation, plus some missionaries directly from the Ascendancy.