Glen, this is very well stated and more clear than before. Maybe the Fuji formula is a good fit for 35mm only, all other formats stay clear of it!

It seems the best approach is to use the standard DOf formulas, but be sure to select a desired cc which is less than what the film is capable of recording at a given contrast level. Then one should be safe.

BTW, I do like the article, View camera focussing by Hansma referenced on Q's page. It offers a simple approach to DOF...I will have to test it out...