450W LED 4x4 4 Photoperiods

What I thought to be overwatering was a heavy calmag deficiency so I have been applying it Foliar ph 6.3 ec 0.8. I have fed them with a 1.0 Ec ph 5.9 feed which is just silica and coco canna to give them as much NPK as possible alongside the foliar feeds to really try to come back from this slow growth.