Ok, I know one of the probs cause I just climbed out of the woods with it myself. Your Micro and your water have calcium and together are giving the plants so much calcium that sufur is getting kicked aside and becoming deficient despite being available in your solution. Unfortunately the GH nutes (except hard water micro) were formulated for distilled water with almost none or no ppm. Judging from my last grow the plants seem to use more sulfur during veg and not as much in flower so that combined with getting your ppm right and you will be fine.
When you see the bluish color on the bigger fan leaves along with a light green or yellowing of the youngest leaves starting at the stem and working towards the leaf tip thats a sulfur def. According to books Ive ready and things Ive read on line MJ uses alot of sulfur so watch how much calcium you put in so that you dont lock out the sulfur.
I chased my tail trying to figure this one out for a long time man. Still dizzy. But my plants have responded amazingly since lowering my calcium a bit.
Oh ya, dont over adjust on the PH. Plants will make it fluctuate. As they take in nutes the solution ph rises cause theres less nutes in the solution and when they take in more water the ph lowers cause theres less water. The GH nutes are buffered and it's natural for the ph to fluctuate a bit. Just dont let it get more than .5 out of range and it will be fine.