Now that you have the new slicks, focus your attention to the front suspension. There's Et waiting for you.
New control arm bushings (Energy or better) eliminate the bushing being part of the spring like bonded factory bushings. The arms must fall under their own weight. Get rid of the stock or jobber ball joints, replace with Afco low friction ball joints. I couldn't believe the difference there. (again, removing bind and friction) Get the trick front springs, or better yet, weigh the car on 4 corner scales and talk to Afco (these guys might have a better company to deal with for drag coil springs) to get a proper rated spring for your car. (I run the Moroso trick springs, had to cut a coil, then cut a further 1.5 coils to get my car to ride height over the years) Travel is very important for small tire cars, and from what I understand, even moreso with radials. I have over 5 inches of front end travel, I can top out the suspension by pulling up on the fender lip, and when I let go it settles back down to ride height, leaving about an inch between the lower control arm and the compression bump stop.
Last time out, the 60' timers weren't functioning, but the final 3 rounds: 6.655, 6.653, 6.649, so the 60's might have been fairly close.