50 plant 2x 600 watt tent growing questions!!

I have a few question about my plants. I have 50 plants in a 5x10x7 grow tent running under 2x 600 watt hps air cooled tubes with a 312cfm fan. I have a 4 inch carbon filter with a 140 cfm fan. and a 14 inch house fan inside running and rotating 24/7 pointing at the lights. I also have a 94 cfm intake fan.

I am growing purple kush in a soilless mix in 2 gallon pots running 18/6. I am on day 13 and have been having heat and humidity problems with the temperature staying between 85-90 degrees while humidity is only 25-40%. i have been misting everynite when the lights turn off and have been watering every 4days and just started adding nutes.

About 15 of my 50 plants have heat stress with deformed leaves forming at the top. I havnt toped and have been trimming the bottom leaves when they need to be but am wondering if i should top soon or now and if topping the deformed leaves will stress the plant any more than it already is.

any advice on a cheap way to keep the humidity up and temp down would be great, also some tips on topping stress plants or if i should would be good to. ive attached somepics of the area and plants.

Thank you

Portable ac unit that you can ventilate out of the grow room would probably be your best bet

thats alot of plants for only 1200 watts................ are they all from clone? then there all gonna be females. so your stcuk with 50 plants. your area is ok with the light you got, but damn 50 fucking plants in that area??? its gonna get crowded quick!! your temps too high, might wanna look into a small a/c unit. and for humidity a humidifier running for a lil bit everyday. i wouldnt veg too much longer bro..... i think with 50 plants and your current setup you should shoot for s.o.g. style. and if those are all clones please remember that clones need less veg time because they grow much more faster then plants from seed.

all the plants are from clones and i was planning to start flowering on day 18 so in 5 days, im planning to transplant into 3 gallon pots the fisrt week of flowering and will train them so they dont get to tall and they are PK so they shouldnt get to crowded if i train them rite? and i am going to buy a small a/c then . thnks

and when would be the rite time to start adding nutes in the flowering period?