Nice job Pat.
As an aside, TBF’s were built by Grumman, TBM’s were built by General Motors under license. Grumman didn’t have the capacity to build all Hellcats, Avengers, and Wildcats needed.
No major changes that I’m aware of between the TBF and TBM.
The TB was the designator for torpedo bomber. F was the designator for Grumman, M was the designator for General Motors.
Hope that explains the difference in them.