I run 6 floods per 24 hour period and still have moist media- you might be over-watering. Does your flood cycle come up to the starter plug and soak it? I'm paranoid about that and like to see the rw or rr plug stay just ABOVE the flood level to avoid rotting the stem.
It also looks like you may be giving too much N. Thos leaves are soft, dark, and dull- N overdose symptoms.
Does your reservoir pH change at all, and do you check it in between feedings and top-offs? I'd bump it to ~5.8-6.0.