A follow up. This was the third day on this dough, and I pulled it from the refrigerator 5.5 hour prior to the cook. The dough was much more relaxed than the prior two balls.
As a result, I was able to create a larger diameter disk and thinner crust. Using the same amount of sauce on the larger pizza also resulted in a thinner layer of sauce. I also reduced the oven floor temp by 20F to 780F. I think that helped by allowing me to keep the pizza in contact with the floor longer, not having to turn it as much. All these factors may have resulted in a better crust.
I think there was still some gum line, but not as much, about a quarter of the slice near the tip. Anyway, I'm making progress!
For my second batch of dough, I think I'll use a bit more yeast and extend the RT ferment. I might try brushing the dough with olive oil prior to saucing at some point also.
Thanks for your help guys.