I was playing Persians today when the Bactrians spawned. I notice that their starting spot (Demetrias) is remarkably poor for a late civ. Their only Food is Sheep on a Hill. By starting them 1S, they would gain access to Rice and would lose only blank Hills and Plains. As its second city, the AI in my Persian game also settled Ai-Khanoun, north of Demetrias, 1W of the Camel and 2E of the Sheep. It's also a poor city, but would be better off if Demetrias was further away.
When I eventually play Bactria, I will move 1S before founding my city, because the default location is borderline unplayable. My suggestion is, why not make 1S the default position?