I am sorry, but cannot tell you anything more on my starter. This one I keep it for me. Anyway, the pizza they do at that pizzeria is not that good as they are drove by the money and not passion anymore and use cheep ingredients. The only good thing they still do is the starter.
I have experienced first handed and also had laboratory confirmation, that is not good to mix different starter together. Instead of improving the results, in most cases, you get the worst of both starters, as you break the balance of each micro flora.
By the way, Ciro uses the Ischia starter I gave him.