The time differential depends on how much time you spend on the track grip limited. It can be anywhere from 2 to 5 seconds depending on the track and tires. I would suggest an intermediate race tire as the next step, you'll pick up a little time and get a feel for more grip that comes with less feedback. Look at Nitto NT-01's and Toyo R888's. After you feel you've mastered those you'll be ready to try out the full DOT slicks.
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