Hi,
You should really only mix the dough until it forms into a ball, just a few minutes. There's no need to mix with a stand mixer for this kind of crust.. -You are looking for something in between pizza and pie crust actually.
I would also stop using corn meal, I suggest you try Semolina instead. ...I personally only use cornmeal on the bottom of the pan after it's been oiled.
Here is a link to a great thread that should get you started:
http://www.pizzamaking.com/forum/index.php/topic,6480.0.html
In reply 507 (
http://www.pizzamaking.com/forum/index.php/topic,6480.msg159547.html#msg159547), member "BTB" shared a dough formulation that I think could fit what you are going for:
For a 10 incher:
Flour Blend*(100%): 245.94 g | 8.68 oz | 0.54 lbs
Water (45%): 110.67 g | 3.9 oz | 0.24 lbs
ADY (.8%): 1.97 g | 0.07 oz | 0 lbs | 0.52 tsp | 0.17 tbsp
Salt (1%): 2.46 g | 0.09 oz | 0.01 lbs | 0.44 tsp | 0.15 tbsp
Olive Oil (6%): 14.76 g | 0.52 oz | 0.03 lbs | 3.28 tsp | 1.09 tbsp
Corn Oil (12%): 29.51 g | 1.04 oz | 0.07 lbs | 6.56 tsp | 2.19 tbsp
Butter/Margarine (6%): 14.76 g | 0.52 oz | 0.03 lbs | 3.12 tsp | 1.04 tbsp
Sugar (1.5%): 3.69 g | 0.13 oz | 0.01 lbs | 0.93 tsp | 0.31 tbsp
Total (172.3%): 423.75 g | 14.95 oz | 0.93 lbs | TF = 0.126875
*The flour blend consists of 80% KAAP (approx. 197 g) and 20% semolina (49 g). The proportions here can easily be increased or decreased depending upon one's personal likes and dislikes.
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KAAP is a type of flour people like top use here. But you can probably get away with any old flour, preferably though "Bread Flour" or high gluten flour.
Study that thread carefully and pay special attention to the way they pinch the dough to the sides of the pan, a deep dish doesn't really need to be super thick and I think that a lot of people don't realize that when they first begin.