Mellissa, when I go to Florida in the winter, I follow I75 south as far as Chattanooga, then get over to US27 which runs west of Atlanta, advoiding all the Atlanta congestion. Anywhere south of Columbus, Ga you can cut across to I75, then south to Interstate10 Florida. I realize you are going north, so would need to look at this route going north. I don't know where you are starting from in Florida, but you will need to go west from I95 to get to Clarkesville, so perhaps this route is worth a consideration.
I have never found the bypass at Chattanooga troublesome although busy. I have never done it, but you can probably catch the exchange for I24 from the Chattanooga bypass.
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