Hello mate, welcome to the farm, looks like a nice setup. Just a heads up watering amounts have no context without pot info, as correct watering practice is dependent on both the medium and container size. As a general observation that's a chaotic and inconsistent watering schedule. Cannabis, and any plant confined to a pot, hate inconsistency and disturbances to schedule more than almost anything. Feeding just water for a week = telling your plants to go starve for a week. There's no nutrient in Coco so they are screaming for food during that time. There are clear signs of nutrient stress, some burning on the tips, looks like nitrogen tox based in the thick, deep green leaves.
Pop as much info as you can here for the best advice. The gurus on here will want all the info on your pot type/size, RH and temps, light type/height/power level, or much better than that a PPFD or lux reading from top of canopy. There's good help here but overall it looks to me like first grow sort of chasing different approaches, if you're anything like me reading something that contradicts what I'm doing and feeling like changing things up. Consistency should be you watchword. The guys here will refer you to AquaMan's thread on Coco watering which will completely change up how you water. But give as much info as possible so they can identify possible lighting issues as well. You'll be right in track in no time man