Looks to me like you have a Nitrogen and Magnesium deficiency going on…I’d bump up the nutrient strength a bit!
Roots Organic is a good soil and I use as a base to my super soil recipe…the soil “should” have enough nutrients to sustain the plant until flower…
Have you done a run-off test to check pH and ppm coming out of soil?
EDIT: For Roots soil I’d run a pH of 6.5…so slightly less than neutral.