I'm just going to throw this out. The AI teams went through the same import that your team went through. Me? I'd continue in v27 and, I wouldn't edit a thing.
This is coming from a guy that has only ever played one serious save. My save was started in OOTP 4 (2002) and imported to every version since. Next year it will be imported into OOTP 28.
Take my advice for whatever you think it is worth.
