I have absolutely no idea where you got any of your information from
you can go as fast as you want on DOT tires, you just need the proper safety equipment to match the ET or mph, NJ used to have a rule that if you were under 18 you had to run DOT tires, so we had kids running 8 and 9 second cars that had "DOT" tires.. technically they weren't breaking any rules, even if they were 15" wide ET Streets.
The street class break at most tracks is 11.50-19.99, no electronics, all DOT tires, full muffled cars.
Pro class the ET break is 9.00, there's movement to get it even quicker, but it wasn't passed at this years track operator meetings. Super pro is still technically a 7.00 break, but theoretically the track operator can run the class however they want, as long as the racers know that at the bracket finals at the end of the season the class is 7.00-11.99.
These are just the bracket classes that run for the Summit ET series. Other classes at different tracks, like Quick 8 and index classes are a completely different animal. If you're talking about Atco's Tuesday night gamblers, I don't think it has any ET breaks that you'll have to worry about, but you will go up against some heavy hitters with delay boxes, so watch out.. If you can hit the tree and run the number, you'll be good to go!
The rule book info however, was correct.. they cost $10, you can pick them up at the track or I believe order at NHRA.com.