I've never experienced anything like you're describing in my snakes either, & I've kept a great many for 35+ years now (mostly not BPs)- but I have to say that this is a job for an experienced herp veterinarian, it's not something we can begin to diagnose in an online forum, other than to share any similar experiences.
And I agree with Lord Sorril that 24* C ambient is too chilly for BPs- their immune system doesn't function well at cooler temperatures- that's why some snakes (not talking BPs specifically, just snakes in general) get sick or even die when brumated (even when they appeared healthy at the start, & empty of food in the GI tract).
It's bad enough to have one or two sick snakes- can't imagine the stress having your collection so affected. I hope you find the cause & effective treatment- & if you do, please keep us posted. You never know when the same mystery illness will turn up elsewhere- & likely it already has, but so far not to any of us currently responding.
I've been very fortunate in that I've never had any sort of illness that affected more than one of my snakes, much less my entire collection at any given time over these years. BTW, I also agree that probiotics (for reptiles) are a good idea after any course of antibiotics given to snakes to help their digestion recover.
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