I use a nute package called SuperNatural. It really does a great job.
Supernatural Terraponic

One thing I've found to work really well is to take a daily feeding/watering schedule and break it into two parts. If it calls for 1tsp of a nute per gallon of water, I'll do 1/2 tsp in 1/2 gallon of water twice a day. Sure does seem to make a difference. In a couple days I'll know the dry weight. Should be well over an ounce per plant.