i dont know what state your plant is (veg, bloom), or the nutes you are using. but assuming you are in veg state, with a full strenght veg nute solution, i recommend 1 time per day, i drip for 10 minutes at a good flow. when i switch to flower i hit the pumps 2 times a day for 10 minutes each. watch the medium, you want it to dry out on the top pretty good, solid drainage - no soggy stuff.
coco is a great medium/ Next to impossible to over water yet hold water well. I've grown for years with the same set up you describe. I've done it all ways. With a drip set up I'd run several small feedings a day. Say maybe 4 feedings with 3 happening while lights are on and one while off.