a hint? so you know what's wrong? If that is the case, stop wasting people's time, lol.
also, while it's correlative, just because a 'mix' worked fine for 1 or 2 grows or other plants doesn't mean you know it'll work well for all plants. Sounds like there's potentially a shit-ton of calcium in the soil to me, but not enough infor to be certain.
the plant is definitely overfed and could be contributing to whatever is causing the taco leaves. the purple is genetics or cold temps. that white film would only be mildew if it was smeared by a foliar spray of some sort, otherwise colonies form in distinct circular shapes, initially. a scop would help with that if unsure... if it looks like a fibrous netting is draped over the surface and trichomes, it's wpm..
'exact same mix' doesn't mean what you think it does... top-down consistency can still result in problems... consistency dialed-in relative to experience is a bottom-up (deductive) endeavor.