If your plants are just beginning to flower, then its good to start off at about half to quarter strength and build up to the recommended dosage. i like to go a bit lighter than they recommend cause less is more with the stuff. it really doesn't take much to really burn your plants, so keep an eye on leaf tips and fringes as you build it up to full strength. I'd just keep feeding them on fridays, or just feed them a really light dose every other watering between feedings. i find that once a week with the 3 tsp/gal ratio works well. sometimes ill go with 7 tsp in my 2.5 gal container. less is more.