Drooping New Growth -- Any thoughts?

I don't know how you would check the roots or what to look for or how to fix anything, but if you are only watering every 3-4 days, dehydration would be my diagnosis, especially if you are not watering to run off. Your plants could also be stressed/extremely exhausted from 24 hour lighting for weeks on end. Since you are growing autos, I do not know what you mean by having "flipped to flower", but for the sake of your plants, I hope this means 18/6. All plants need "sleep" and cannabis is no exception. Without "sleep" your plants, apart from being flogged, can not undertake certain metabolic processes that they can not do during the light/day cycle, meaning, by giving an unnatural continuous light for weeks, your plants are missing out on rest and repair, which occurs during the night/dark cycle. Besides, cannabis can only grow so much during any 24 hour period, and this growth tops out at about 18 hours, meaning running your lights any longer than 18 hours is basically a waste of electricity. And totally unnatural. I like to think of their 6 hours of sleep as - 2 hours to rest, 2 hours to repair and 2 hours to get ready for the day ahead, and this is basically what happens during the plants "sleep" time. 18/6 was/has been arrived at as the most optimal lighting for cannabis through 80+ years of scientific research and is not a random number. Anyway, make sure to water your plants thoroughly, go to 18/6 and I am sure your plants will be much happier and healthier. Hope this helps,........ Organoman.