I've gone to feeding lightly at every watering and really like the results. A lot of nute producers give you a "feed dose" and a lower "maintenance" dose. I've been feeding every time at the maintenance level. I started doing it to arrest a nitrogen deficiency, did some research in the meantime, and became convinced this is the way to go.
What this does for you is create a consistent nutritional environment, as the availability of water and nutrients become linked together. When you feed, then plain-water, what you've done is spiked the nutrition level but then, between the addition of plain water and the amount used up by the plant in the meantime, you've cut it way down again. Maintaining consistent feed solution is essentially what hydro endeavors to do by maintaining ppm's (ie. nutrition) consistent with a plants' stage of growth.
I know other ways work; not saying this is THE way. But there are a lot of advantages to it.