Its gotta be some sortve deficiency, lookin sortve like a Mg deficiency on some leaves I see. 1 cup/150 gallons isnt much, you could easily double that. I use the equivalent of over 3 cups of A&B per 150gal, granted I'm not in soil. I dont understand why the hieight of your plants vary from 7in to 5ft? Also, you arent still using voodoo juice this late in flower are you? Also, are you sure you pH pen is properly calibrated? You could raise the ppm on your nutes, but you should actually start flushing soon anyway. If you wanna make it easy on yourself, go organic, its pretty mcuh impossible to screw up with organic nutes.