Calcium, Magnesium, P, Zinc def?? Help Appreciated

Seem to be having a problem with two of mine nine girls: yellowing of leaves between middle and top. I just repotted all of them today as they were getting a rootbound (mainly at the bottom of the pot) in their previous containers. 3 days earlier I fed them at 1.2 EC with some Plagron Grow and Roots and the yellowing started about 2 days later. Please refer to the attached images for a better idea and a list of growing details as follows:

Strain: C99 (Female Seeds) and Utopia Haze (Barneys)
In Veg for : 34 days from sprouting
Seedling or clone: Seedliing
Growing in compost or other medium: Somas soil mix
Water : RO water
pH of the water + nutrients you give: 6.5
EC of the water + nutrients you give: last feeding EC 1.2. Before that EC 1.0
Temperature lights out/lights on: Lights OUT = 24C. Lights ON = 25-26C
Relative humidity: between 65 to 55 %
Nutrients, which and dosage: Plagron Grow, Plagron Roots, Plagron Phytamin.
pH of the medium (if you know how to measure): +/- 6.5
EC of the medium (if you know how to measure): recently repotted to a 2.0 EC medium. Before that it was lower..dont know.
Symptoms you see on your plants: Yellowing of leaves as per pics

they look pale give nitergen on pic ten that leaf in your hand looks like mag def do to the purple veins in the leaf

try some cal/mag out. I'm using all GH products as well, had a similar problem and their CALiMAGic did the trick.