I`m working with a similiar sized grow groom, in a boxed off area inside a closet. Good to here you are not having any heat issues. I`m using a 400w in a cool tube and heat was my biggest concern. Love the armoir I had a similiar setup with flouros in my old apartment.
Don't listen to this guy, I don't know where he is pulling this info from.. As long as you aren't expirencing any heat problems and your plants aren't burning you are fine. Your plants will either stretch because the light is too far away, or burn because the light is too close not both...
And a sog and scrog or two totally different things... So quit acting like you know something..
I would raise the hps light some. The upturned leaves usually means the plants are getting blasted with heat.
Watering is sort of a lazy man's science. Wait for the plants to need water than over water your plants. Check the soil every every day, when it's getting dry add some water. If your plants are less than 1 ft tall, watering every other day is most likely too much. The droopy plants are telling you their overwatered..
I`ll be w atching this, excellent build man. good luck on your plants.