First, I hope the damage is minor to your engine. 2nd, I'm glad you had a good time. That's what it's all about afterall.
You bring up some interesting points about their afternoon racing program. I'm curious, did you book your hotel rooms before the event, or did you decide on your driving plan after starting? Seems like if you got in the lanes early enough, which you always do, that you could drive part of the way to the next venue before it even got dark, making the day drive pretty easy.
One thing I like about the morning racing is that the short drives to the track means the engine and compartment isn't heat soaked, so checking/changing plugs and pulling the exhaust isn't such a dangerous mission..lol But you do feel rushed to make it to the next hotel. And the morning rush to get in the lanes is always pretty hectic.