I would up the cal/mag to 2.5 ml per litre the next feed mate. For at least one or two feeds, or even up to a week. Just to see. That's progressed much further than I thought seeing these whole plant pictures. So definitely hit them harder with the cal/mag. It looks like it's effecting the upper fan leaves so i'm really really thinking now calcium deficiency big time. Which is going to effect the size and fullness of the buds. So hit them now with even more calcium bro.