I try to water pretty slow I have had problems keeping under and over watered. I use air pots so they sit off the ground but they do dry out quickly sometimes you think maybe give them a flushThey don't look too bad, just a bit droopy. They look slightly over fertilized, but primarily they look a bit over watered. When you apply water, do you just dump it in quickly in one pour? The reason I ask is because the plants look over watered yet the soil looks really dry.
Do those containers have drainage holes on the bottom? Make sure the pots are raised off the ground a bit, that way your runoff doesn't get reabsorbed.