im glad theres others out there to try and help you and your wife. they are giving you alot of good info. in my opinion you def just need to get the temps lower and stable, i had a temp and humidity spiking problem when i wasnt using good enough fan. without seein what the room looks like and you tellin us that your using two 1000W is way overkill more then likely if the room is a smaller room, i have a 400W in a 4X6X8 room with 8 plants and it was still to much heat without the proper cfm fan that i have now. you should try and keep your temp (flowering) around 75-80* with a 40-50% humidity when the lights are on, any more the 80 and they will have stress. at night when the lights are off you want the temp to be around 68-75* with same humidity. on the nutrients topic (agian in my own opinion) is to use a good soil like "Miracle grow moisture control" or better and not to use any nut until you switch them. i love Fox Farms Tiger bloom and Big bloom, these two make a good harvest with hi thc content at a fair price(i paid $20 a bottle). dont use the recomended doses and start them slow and gradualy add more nutrients, to strong at first will burn them. your yellowing leves sound like a lack of Nitrogen. dont forget to flush with 3X the amount of water per gall of soil around week 4 for if you use nutrients just to be safe and release salt build up from hurting them. Good luck to you and i hope all works out well for you AND your wife