Phill, I sugest you check this (or other):
http://24timezones.com/ to double check your time difference. I think you´re miss calculating by 1hour... if not, sorry, just trying to help

About the cars, I highly recomend you to run several cars, with (maybe) different settings. Not becaue the corvete isn´t a good car, but probably not the fastest (tough I don´t know wich model you´re using...) if you´re aiming for the podium

Tough, if you are happy with the balance of it, and gonna try with no pit stop, you may have a very good shot! That´s the beauty of (this kind of) racing, with so many possible stratagies. Just do what you´re more confortable with.
Now, about my choises, if I told you... I´d have to kill'ya

But I'll definitely use more than 1 car troughout the series, depending on track...
I know for a fact I´m not the fastest here (I know 2 guys here, and they´re fast (er)!), but I'll do my best to put up a good fight in every race, and will not be holding on to my favorit car, if it's not the best for that race, you know what I'm saying?
About today's race, I'm crossing my fingers so hard they're getting purple, haha
I'm 30, but i'm feeling 20years younger

C'MON PSN!! Some people depend on you to LIVE!!
"by the yes, by the not", I'm in my second practice session of the morning...