Don`t sweat it too much these plants they will still give ya back plenty by the looks of it. Tbh i`m thinking more early
Calcium deficiency now and not
Phosphorus deficiency, it could maybe be a bit of both feck knows tbh.
As for calmag so yes your adding that which effects EC, raising it, so in effect basically you`ll be running a higher ec of whatever cal/mag your adding on top of your AnB ec cus you don`t wanna run same EC you were at or you`ll be throttling plants of base ferts which contain everything plant needs. Tbh why not just raise those a bit anyhow and drop cal/mag if your gonna do that. Generally if your running right ph and getting deficiencies put plain and simple it`s just underfeeding 9 times outa 10 in my book. If you get me, i just about get me lol
Too much pk boost will soon fry leaves and crisp leaves up by the way although usually it`s nowt worth worrying over a bit too much