Mesophyll cell collapse-- what should I do with my collection?

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After reading about it, I am pretty sure my collection has Mesophyll cell collapse
The funny thing is, regardless of whether or not the fungus on my other non- phals is this 'Mesophyll cell collapse', my Paphs and Miltoniopsis are the only ones that have not developed some form of markings.

Anyways, what should I do? I am going to continue to use a fungicide treatment on all my plants ( as I have been doing every week). only 7 of my collection ( of about 25), the 3 pahs and 4 milts show no symptoms, about 7 more have little marks here and there, though it seems controlled, and another few seem to have more markings. At this point, it would be pointless to throw out a large portion of my collection, since most either have it, or seem to be imune to it.

It is also annoying, since I do not want to spend more money on plants that may potentially catch this bacteria.

What would you guys do?

Thanks
Cam