The more you work pizza dough, the worse it's going to be. You have to let it relax and stretch on its own. The best way I've found is to let gravity do the work as I slowly turn the dough between my hands.
PS. It's better to par bake the crust for less time. Leaving it in too long will overcook it. But if you don't par bake them, they may not cook through with the sauce and toppings.
PPS. You don't have to mix flours if you don't want to or have them. All purpose is perfectly fine.
