If you are buying commercially frozen dough balls it is highly probable that the dough has not received any fermentation at all, just mix, divide, round (ball) and straight to a blast freezer and then to packaging. We looked at this a couple of years ago and found if we slacked the dough balls out in the cooler as you are doing, then brought the dough balls out of the cooler for an hour and placed them back into the cooler for 18 to 24-hours, then brought them out of the cooler, allowed them to temper to 50F at room temperature before beginning to open the balls into skins the resulting crusts were far better than they were when we just slacked out the dough and began using it. Without any significant fermentation on your existing dough I’m guessing that the finished crust is somewhat dense thus making it even more difficult to get a proper bake on the pizza, this would help to address that issue.
Additionally, what type of baking platform are you using (pan, screen, disk, etc.) and what color is it? When it comes to problem solving there is no such thing as TMI, anything you can provide will help us figure the problem out.
Tom Lehmann/The Dough Doctor