WWM/PP/BB/SSH

got my HPS light setup so now I have 800W=400W MH and 400HPS working at the same time (Ihave read many debates about using MH and HPS at the same time,,need your opinon, but I am convinced). the distance is 60 cm away from the plant. I want to lower the light more but I am scared. I had the light on 24/0 but yesterday I have shut the lights off and mist them with water and gave them some dark for 6 hrs, I think they are happier now with the dark period,so thinking to swithch to 18/6 of light cycle.
I got infrared temp pin and it measure the temp of the leave itself around 70f. Also I got a digital thermometer/hygrometer and the temp around the plant is 80 for both lights on and 75 one light on and 70 when light is off. Humidity is 25%-45% when light is on and 30%-50 when light is off. (I think it is low, thinking to get a humidifier,dont you think?)
waatering every 2 days. I start adding nutes 2 days ago with light fert 5-3-8 and they are happy with it so far. ( let me know when to add more) I got a formuls of 20-20-20, supermagnitro 10-0-0+13mMgO+T.E ready to use later on for the veggy stage. (please shcedule me for the nutes I got).

I shut the HPS system down of because the hat of the light painted in silver so it produce awfull smell when the system heats up so I am waiting to go to work and let it work the paint while I am not home ( i think because it is still new, you know what I mean). the MH didnt do that because it is not painted and different brand.
ok here the babies at day 16 working on the 3rd set of leaves ( do you think they are slow grower, they are almost 5"=the stem 4", the leaves 1")
#2 WWM
#3 WWM
#1 WWM (the sick one, I think it is not sick, may be she just got heat burn from the light to her half of her first set of leaves the other half connected to the stem is green. Thats happened to her the day I got the MH system . but she still green and healthy overall. She may be stunned at the time she got burned and I was panic so I repot it her burying have of the stem under the soil because she stretched due to weak light when I planted them. So I think she slowed growing as the others because it may develop more root system out of the extra buried stem and not concentrating on the top. ,what you guys think.)
do you guys recomment burring the long stem of the other 2 plants when I repot them. Should I repot now.
#1 &#2 PP are growing ok so far but still developing the first set of leaves ,I will post pic of them later.
plz roll a joint read the post comment and advise.