I travel much the same route as PP. From exit 33 in SC.
A lot of the road construction in GA has cleared up. It's much better than it used to be. There is still a little around Brunswick, but no super narrow highway.
Also, Jacksonville is still a little white knuckle for me, but about 200X better than it was a year ago. It looks like they have 90% of the freeway finished. The speed is still 45mph, so that helps some.