I guess you can't send files through PM, so here is the 20550 Indy tune with the changes to the F-L switch that I hope will eliminate the stalling issues. Please let me know how it goes, if my theory is correct this will eliminate it completely, but if my theory is not correct it will not. You can provide extremely valuable data that will provide insights into how the F-L switch works.
Select one of the two at random, load it, and see if you can tell the difference. The only difference between any of the tunes mentioned in this thread is the F-L switch settings.
You may need to uncheck SAI depending on your setup.
Thank you very much,