GH Floranova Expert drain to waste in 100% coco

I'm having a hard time finding any documented grows with the GH Floranova EXPERT drain to waste in 100% coco (in 10 gallon fabric pots) combination. I still consider myself a new grower even with a year and a 1/2 under my belt. I've followed the floranova expert feeding chart to the T for the last few grows and I haven't had consistent results either due to bad genetics..
I understand that growing in coco you need to add cal/mag to the program. The expert feeding chart doesn't have cal/mag on the list, what the hell! I haven't added cal mag for the last few feedings in veg (just flipped to 12/12) and the ladies are turning light green. I added 5ml per gallon for the 1st feeding in bloom and I'm hoping that it will correct the problem.

Should I ditch the GH line entirely and go with something else?

any help or advice would be adored with great lust

I like to keep it simple and use as few nutes as possible. I only use Jacks Classic all purpose, epsom salts, and gypsum... I pH to 5.8-6.2 for coco.

Its just a matter of learning how strong the Jacks is so you can dose your plants properly. It doesn't take much. 1 TBS per gallon is fairly strong feeding.