Début de floraison → Pointes des feuilles jaunissent et finnisent brulées

Check PH, also light intensity. R/X: Back off on feeding. Just water but not as much. If they come out of then resume your routine. While you're waiting rethink your feeding mix. You're either feeding too much or the mix is to strong.

Manganese would start from inside the leaf, not the tip. Iron deficiency leads to interveinal chlorosis, where the tissue between the veins yellows while the veins remain green. Iron fits; let's check other possibilities first, The only other nut deficiency that can cause chlorosis is an excess of potassium, magnesium, or phosphorus, which can also contribute to chlorosis by interfering with the uptake of iron and manganese. But those are mobile nutes. I'd expect symptoms to be present in newer growth primarily. Droopy, wrinkled leaves indicate water has started to accumulate in the leaves. Transpiration is low, and tugor pressure is low, also possibly high EC from yellowing tips. Check your PH and make sure it's not in the 7s; iron will have trouble when alkalinity rises. Probably just feeding slightly faster than she is using it up, leading to eventual drifts in EC and PH and all the usual suspects that come with it. Impossible to guess root cause without a diary and history for sure id say Iron deficiency, if I was forced to pick one. Gluck.

I think your plants are being overfed. Allmix is a pretty hot soil. I'd either mix it down some or start using a lighter mix and provide fertilizers yourself.