One other issue is all this feed interval talk. I've always been on the theory that in flower you want to have wet and dry cycles to trick the plant into thinking the season is running out to produce more resin to catch pollen. If you're watering every three min for thirty secs I don't see how the proven wet dry cycle can be achieved. This is why you see growers like the jungle boys use small grow cubes, to root bound the plant in order to get the most wet dry cycles possible.
You obviously grow in soil. Wet dry cycles are not necessary for coco. Coco has fantastic drainage and a perfect air to water ratio inherent to the medium itself.