I am not sure what a 'not ready' error means, I guess the reason that most people are telling you to keep driving it is because, due to the battery swap, the equipment needs to be calibrated or averaged in some way by a computer? I would think your 200 mile road trip would be enough, but maybe it is looking for city type driving (stop and go like traffic)?

Try visiting the Renntech website, and call or email them. They must have a authorized installer/repair site in the Atlanta area, at the very least maybe they could give you some advice on what you need to try yourself.

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)