Congrats on the nice time. I have been out to Lapeer 13 times int he past 3 years with my Camaro, making over 150 passes. The one thing I can count on at that track is the inconsistency of track prep. Sometimes we hook sometimes we don't. I would think that if you can catch the right day, (usually early spring or late fall), with good air, get those tires warmed up well, allowing that 60' to drop a little more. You should see another tenth or two while still in stock trim.
Have you heard of our club?
Detroit 5th Gen Camaro club.
Come check it out, join us, we have many members who go out to Lapeer and make a day of it. We do many of the local events together and hang out often at various locations. Would love to see another 1LE join up.