The more I study it, I'm gonna say definitely MAG def......Your potassium prolly fine. I would go light on the epsom and add another 5 ml. Of Demeters to your feed, possibly 10 ml more. Your stacked up so she is about ready to swell all those calyxes up. Correct it with the epsom and then let Demeter take her home. Win win too, more calcium for BK.
I've been wondering why the reammend recipe/recommendations don't include fresh coco to replenish the mix when its the lines main source of magnesium delivery......and potassium.