Long shot here, as well...
Substituting semolina is a start for getting a crispy crust, so it looks like you're on your way to reproducing it... Eliminating oil from the crust will help, too. Why not take your favorite dough and tweak it?
As far as non ingredient related things go, you'll need a thoroughly preheated baking stone in an oven that goes as hot as it can. I get the best results baking on the topmost tier of the oven, so that the pizza is close to the heating element. It registers around 600F on my oven thermometer and takes around 4-5 minutes to finish. I'm assuming that the pizza you're talking about is thin, of course.