Overwatered?

based on the amount of perlite i see, i doubt it is from 'watering too fast.' If the medium is constituted properly, that's nearly impossible under any normal circumstances. If it is at the end of the day, it could be just a bit too much light and the plant is shutting down early. If it's right as the lights turn on, that's normal to be droopy in the dark. I'd wager it has something to do with irrigation practices. By the way you've talked about it, you're still trying to find a good rhythm. Keep it simple. 1) fully saturate - don't try to give a pre-ordained amount. You give what it takes. If this is soilless, also get 10% runoff. Eitherh way, dry pockets are the concern. 2) wait for appropriate dryback / loss of weight. If it's the same loss of weight, it'll take a predictable amount of water. So, consistency helps in that regard. Definitely don't let it wilt, that's letting it dry too much. You don't choose the volume. You give what it takes to accomplish the task. This will never cause a problem in a properly constituted medium. You may or may not need more perlite, but it certainly has a fair amount. coco should be 33% perlite by volume. A higher water capacity medium should be 50%. Perlite or vermiculite etc.. options exist. A typical store-bought soil or sphagnum peat moss base should be 50% drainage/aeration amendment. A little less is not a major problem. plenty of people have grown fine bud with a less than idea gas:water mixture around the roots :P but, something to stick to in the future. makes it impossible to cause any problems watering assuming the bare minimum common sense.