I have also been researching the McGees & McGehees. I have found that the McGee spelling came more from those immigrating from England and the McGehees were immigrating from Scotland. That being said, I, too have found multiple LNABs for the same person. I try to do more research to find records to document the spelling. It is difficult because people change the spelling of the name during their lifetime. I aslo look at the parents and children with sources to establish a pattern for the spelling.
Here is who I am researching: https://www.wikitree.com/wiki/McGehee-32
I noticed he is also from Georgia (like your profiles). Wonder if they are related?