Once you get a feel for how the tires react to the prep, and how they run on the track you can try to adjust prep inside for different situations.
Also as mentioned just scrape the tires with a heat gun to remove rubber build up. Not usually much surfacing done unless certain circumstances. We only scrape our tires at the end of the race day, not after each session on the track. Some prefer to do this differently. We will change tires 2-3 times a day though. But, we'll run practice on the same set, and maybe the heat, then change for feature. Or change for heat and feature, just depends. You have a Pm...