Welcome to MidwestWife, Claudbaker, and Wholebodynumbness?
Claudbaker, you'll probably be glad you got the French drain. The apartment building I live in installed one many years ago and it's still working well at removing the standing water that was a constant problem in the north area of the grounds.
I'd always be in favor of not moving just because moving is ALWAYS far more of a bother than a person expects, but I have had no experience with mold issues--though a neighbor's apartment was found to have mold, and she stayed right where she was while putting up with the considerable nuisance of having HEPA filters and other inconveniences for a while.