It sounds like that Bonide spray is the Triazicide Once and Done bug stuff mixed with the commercial grower’s Pristine product. I think you have a good idea alternating “Pristine” with MFF. In lists I have seen of effectiveness for brown rot, e.g. http://www.ipm.ucdavis.edu/PMG/r5100111.html, Indar is #1, MFF (propiconazole) is #2 and Pristine is #3. I don’t want the pyrethroid so the Bonide spray is not good for me and the only way to get Pristine is in commercial quantity.
Re your copper dose, you are close with that but hard to say beyond that. Kocide 3000 requires less than other coppers I used previously (Champion and Kocide 2000) so I would probably up it to 2Tbsp per gallon - Kocide is more efficient per pound than other coppers.
I agree copper is best avoided, I only use it when I have a serious disease issue needing attention. Apples I phased out copper when fireblight got to be not so bad. Peaches I am currently down to once a year from twice a year, and I may try phasing that out as well.