That is bad, for my coco in 3 gallon pots takes about 1/2 gallon of watering to get around 10% run off. Sounds like you might need to get your water cycling and times down and get into habit at water at those times. Coco can be very easy to grow in and can do wonders it just the watering sucks ass that why most ppl get those hydro rings with pumps and timers to do the watering and all you gotta do is get rid of run off
I'd say temps are off, using led you need higher temps, due to lack of ir that hid supplies. the leaves turning away from the light are an attempt to save itself, too high ppfd and the lower vpd leads to the plant not being able to uptake the nutes and process the light energy.