"RT's crust is almost more like a biscuit in texture, yet chewy to the palate. Is Shakey's similar to that? I never had good Shakey's before." Very complicated question grasshopper.
Both chains suffer from inconsistency.
Shakey's - no better pizza in the world when they were in the Sacramento original location with Shakey and the gang.
When they franchised, Shakey sold out and chains went their own way. With passing franchises the pizza was whatever the owner and the kids he hired made it. Today it is usually good in Redlands and Inglewood and a couple of others. Not so good in Palm Springs, Westwood, Torrance, and Fresno. When it is at its best, the pizza is light, crackery, with wonderful voids like a croissant, with a little chew.
Round Table - when it is at its best it is more biscuit yet chewy as you described.
The difference in RT stores I believe is in the sheeting. This style has to be layered and rolled thin and kept cool. Too much handling produces a tough dough which RT does suffer from and too thick gives the cardboard characteristic.
Pizza making is about getting the proportions, time and temperature and handling as accurate as possible. Hence it is a science.
But you cannot cheat by substituting different brands of flour, for example or using lots of scrap dough.
It is also tasting the final product and determining if what you got is what you wanted. Hence it is an art.
This web site is the best at discussing both.
Your premix is an attempt at the science. The manager just adds water and sometimes a premeasured instant yeast package.
BTW, RT premix uses dry milk instead of whey and no baking powder. It uses Crisco instead of the oil. Shakey's uses Crisco.
I collect pizza chain bags when they accidently blow out of the dumpster. Don't do that. It would be wrong.
Especially if you can find the information at your restaurant supply store or the Gold Medal web site.
These guys know what's going on. It's their business, if they can stay in business (Cash & Carry).
Good luck and let us know when and where you find a good pizza joint.
Both RT and Shakey's need to add