![Tiphat :toke: :toke:](/data/assets/smilies/tiphat.gif)
Hey
Bay'! ...looking over what you mention here,... what's the NPK#'s on the nute's? I don't think this is an N-tox issue, that affects the tip (claw) and mid-ribs (strong bowing) sometimes,... note the petioles are bent, which hints at a moisture problem,... now, some plants do that day/night leave droop thing, which is not unusual, but not always consistent, and since you're getting some of that action, it might be more than one thing in play here,.. you mention waiting until they feel light to water, and set amounts... If soils get too dry, they can form hydrophobic patches within the pot (fabric pots can make this worse), and when you water, uneven hydration occurs, even if they "feel" well watered! ... combined with the lower than optimal RH/ warm temps, there's a strong transpiration demand on them and maybe can't keep up... before you flush (that's a last step measure to take, a stress in itself), do you have a wetting agent? This will take the surface tension out of the water/nute soln., and help penetrate any potential dry spots in there, and water to significant run-off-- slowly, to make sure it gets soaked up evenly,... I've had plants do this before, and sometimes the petioles stay a bit bent and look droopy all the way to harvest. So, a no-nute, wetting agent (I like Coco-Wet) heavy watering will help any potential dry patches, and maybe don't let the wet/dry water cycle go so extreme,... Oh, Superthrive is excellent stuff, yes! Add that in to help the roots, maybe even a foliar spray too, which will up the RH for a bit, and speed the moisture and goodies in there faster,... use that wetting agent always when doing foliar, and if you can, remove the plants away from the light/heat so it doesn't dry in 2 minutes! Get me some normal light pics too mate, if you can,.. I don't see any signs of other trouble so far, no leaf margin curl, burnt tips, etc.,... but HPS is lousy for diagnostics! .... and yes, organics or not, soil pH should be monitored... best tool for this is a in-pot pH probe, like the Accurate 8-
![Thumbsup :thumbsup: :thumbsup:](/data/assets/smilies/thumbsup.gif)
... I hate the run-off method, and with organics/supersoils, it has it's share of negative impacts on things,...