Sorry to hear about your troubles on your first run. So Cal to FL is very ambitious!
Mine ran hot as well. Ran 210 - 220+ and got the light on once. In fact I've been working on improving the cooling system for the last two weeks and finally got everything back together yesterday.
There is a post about my ordeal under "radiator blues".
After getting back I took a closer look at the cooling system and belts and can't believe we made it without breaking down! I should have known better than to go.
You may also want to check out the thread on "Water Wetter"
A few members have reported as much as a 20 degree drop in operating temps using this CRC product. I've just added it to mine after the rebuild.
Good luck with your "new" 345. We love ours.