My above mentioned plants are doing real well now. I was seeing some of the same colors you are. The pale yellow-green foliage and some spots on the lower leaves. The solution to my problem was to actually increase the feeding. Mine are a little smaller than yours and already getting a combined 800+ ppms of Botanicare products.
I am not an expert, but after hesitating in increasing my feed for weeks, i finally did it and things are happy.
It may be that the "light feed" of nutes is not enough. Try increasing it on one and if they are in fact just hungry then you should see it within a day.
I am only sharing my experience, and could be totally wrong...but maybe not:jointsmile: