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Ya, your 60' time needs some work. What kind of tires were you on? How was the track prep?
Im running 245.40.17 michelin pilots. I was running 20psi when I ran these 3 times and I still couldnt get any traction the firs 60-100ft. I had to let out of it each time to regain traction. I would be well into the 13's with some d/r's! But I didnt think it was too bad of a time for a mostly stock stang. The track was prepped ok they cleaned it every 100 passes or so.
Suspension and tires will have you knocking on the door to the 12s. But you're in a fun place right now. The more practice runs you make, the quicker you'll get without spending any money. Enjoy!