Toof Decay - 3rd Grow

I seem to have two different phenotypes. Two of the plants are shorter, dark green, and buds are more developed. The other two are a bit taller/lankier and lighter green. They seem to be about a week behind too. I've been feeding them accordingly. The darker plants I've cut back on the nitrogen and have been keeping the P/K about the same. The lighter/taller plants I've been keeping N about the same. I also did a light flush with Sledgehammer on the two darker plants. Runoff on both has been in range (6.4-6.5 pH, < 1000 ppm) so I'm happy with that. I've been noticing a little bit of spotting on the taller plants so I may bump up the feeding a little this week in case they are hungry. I don't suspect it's pH or excess nutes causing lockout. I don't think I'll ever run 4 plants in a 2'x4' again unless I know they'll be really small plants. Even though the humidity has been in the mid-to-low 40s and I have 4 fans going, I've noticed some moisture on the walls of the tent. I've been trying to move the plants around a little during the day to prevent any wet spots from being targets for mold. Also trying to keep the colas off the sides of the tent.