salvadori here in Florida we have a state series for like the last 4 years we have run spec tires the take off cs27.
What we found was it made it a closer playing field. But we also only allowed two complete sets for the weekend ( 3 qualifiers and a main.).
As for motor its was more a hassle for the club to do handouts, and racers complained about sluggs. So we open up to run what you brung stock 27t and 19t motors every one is happy and we brought back racers because tire situation got cheaper and better pluss better motor selection.