Hmm...still not sure what's the deal; the discoloration doesn't seem to have really improved or gotten worse over the weekend, not even certain it's changed all that much from the beginning on closer examination.
I gave the plants another hydrogen peroxide misting today and I'll keep that up for a couple days straight, see if it makes a difference.
The plants are still getting fatter and stinkier, so I'm not too concerned about their overall health. More than anything at this point, I'm just baffled as to what happened or how to prevent it in the future.