Pre-baked crust sounds like something to try, although I would be concerned that I would burn the edges later when baking with the toppings.
I like the various recipes in the Company's Coming Pizza book. There is a good variety of tasty crust recipes (and more) in it.
I use cornmeal on my pan too, and I also bake my pizzas @ 425 degrees for 20 minutes.
The best crust recipes use "00" flour, which is the flour of choice. You are not going to find that in our grocery stores. Does anyone have a source for it besides online sources?
If you look at the wood fired ovens, their temperature is very hot. Many can teach temperatures of up to 900, and your pizza is done in 2 minutes. You bet that you will get a crispy crust from those!
Here is an interesting tidbit to try on pizza crust if you have time. It helps build flavor into the dough:
http://www.abreadaday.com/the-autolyse-method/ It involves first mixing the flour and water only, then leaving for 20 minutes to 1 hour before adding the other ingredients.
I find this a tasty and interesting thread. I enjoy troubleshooting food in order to make it better.