Mason's formula is very similar to FX-1 without iodide.
Its pH will be around 11.5
Developing times for FX-1 at 68F:
Pan F 12m, FP4 13m,T-max 100 20m
Plus-X 12m, Adox 50 17m, Adox 100 ~17m
The last three are old emulsions and give good edge effects if agitatated only every 3 min and the development extended by 50%.Medium format is better as the resolution is not very high,but the prints have an interesting unusual appearance of being made up of sharp grains with slight haloes round dark objects.