Was a VXR you raced was it? As that would have tashed you surely?
As for the weather, I heard it was perfect weather in the morning for runs? Cold (intake temps) wind was blowing you down the strip (rather than against you) and by 10am (time f your run) the sun had come out to warm up the sticky stuff again.
Id say your time was spot on for the power you have, unlikely to beat it unless you have less weight, more power and/or slicks.