AsNoriuanswered grow question 2 years ago Overfeed and nitrogen lockdown, just pure, good ph water, better dechlorinated before ph adjustment.
After 2-3 wet/full dry / wet / full dry and etc cycles, you can give her every second feed with cal/mag but not kore than 0.5 ml/l.
After 3 weeks you will have time to give her pk boost for few weeks before flushing.
Still should get something, leave those damaged leaves till they die off / wilt naturally . She needs all help and all tools.