New York style pizza dough
First point I would not is that the mixer you mention (Avantco MX20 20 Qt.)is not recommended for pizza dough as stated here

Secondly this not withstanding the capacity of this mixer for bread dough is 16-18 lbs (7-8 KG approx). By my calculation you are trying to mix around 30 lbs (14 KG). Avantco MX20 20 Qt. specification

My recommendation as a short term measure is halve your batch size.
In addition as recommended by others, weigh ingredients. Measuring dry ingredients by volume will always be variable.

As a long term solution research in to getting a specialist mixer for pizza dough.