To past Question

They are recovering nice in new boots, but answers were right. People gave you path, you know all situation and choose . Heat can cause it, especially when they are so crispy - would say heat and light intensity ... Wind damage exist too. Curl would be with twist, but still possible ... Root issue first signs could be that . Even after watering with cold water you could see them going close to that curl ( just leaf would be super perky and crunchy, not dry like with heat damage ). Cold temps during night act same sometimes... Think with certain conditions and overdrying of soil you can get that curl ( not totally sure, but if i would go through my diaries, think i would find such situation ). All behind with you, i saw magnesium signs, but with bigger pots i see nothing now. Still make sure you have good wet/dry regime. Lift pots to know when to water them. Human hands has amazing weight memory, works better than any scale ( some use them too just to get the feeling ). Have fun !