Is it just me... or did the track feel like it was prepped well the first half of the day, then felt like crap the last half?

I was cutting 1.7's all day long in the first half of the day... then I started cutting 1.8's and my car kept getting sideways on the launches... =[


Very fun day though... time went by real fast. I wish the track stayed open for longer for more test 'n tune... =]