When I saw the pic, my first thought was "magnesium deficiency, could use some epsom salts".
But just readng that you used Maxibloom, 2 weeks ago if Im reading that right? I might think your low in nitrogen, Maxibloom is a hydro nutrient, nothing wrong with that in and of itself, it can be used in soil as well, its just that it needs to be used more often as its not a time release fert, basically every few days on a regular basis. So if your using it only once every 2 weeks you could be starving your plant of its needed nutes.
Also, I think your using a "bloom" nute, might help to use a "grow" nute until your plants are ready to start flowering or when you want to help instigate flowering then switch to a "bloom" nute.
Im probably wrong, but just a thought.