Droopy leaves

Hi, new grower and having probs, on day 13 of flower cycle, using 600whps, plants are 19" tall, good healthy looking plants apart from drooopy leaves like their struggling to support their leaves, it`s like they have no evergy, it`s not like wilting but droopy leaves, touch the leaves and they spring back, light is 19" above canopy, temps are 74 deg, got oscilating fan on them, they start drooping at end of light cycle 2 hours before lights go out every day but the last 5 days their still droopy when light comes back on, after 4 hours they seem to perk up but not to full strength .1 plants does perk up quite good, 1 is a bit better but one only perks up a bit just dont look like they used too, i am using soil, bio bizz ,all mix, think i have overwatered ? the leaves are all lovely healthy green colour, plants are in 3 gallon pots, just wish they would spring back up, just can`t seem to figure out what`s causing it, did watered bit soon i think, and also the tips of the leaves are bent over slightly , is this cus the leaves have to much water in them ? be very greatful for help , been 6 days now since i last watered, pot feels light, shal i water ?????

with droopy leaves the first thing i would check is your watering schedule. droopy leaves is a classic sign of over watering. GL

Need pics!!!!!!

pictures say a 1000 words but you've pretty much written a 1000 words

just checked on them when lights come back on and they have perked right back up, must have been no air to soil i think i def over watered, watered one of them and left other 2 cus their pots seem bit heavier and still quite moist, see how they get on, keep you posted