Plants are definitely looking a lot better now. The smaller two are still smaller, but they actually look healthy now and seem to be catching up. I'm still using the FoxFarm GrowBig as a foliar only since the one plant still shows a little bit of chlorosis, but I'm weaning off of that since I don't want to be spraying anything on the buds. I switched to MaxiBloom and Liquid KoolBloom and I'm tapering the ppm up to 700 until the final taper. I know the chlorotic one could probably use a little more N, but after all the nute burning before, I'm definitely taking it slow on any ppm increases.
hang in there. For the most part, these are pretty forgiving plants. After all, it is a weed. I screw up my pH all the time, so I feel ya.
Peace and may your GSC develop some StinkyBudz!