Flowering girls are not well???

So my girls have been in flower for about 7 weeks now. I am using drain and fill set up, with advance nutri. and the ph is kept at 6.5. I have added a really small amount of espon salt as well. They have been starting to get brown tips at first all over. Now they are starting to get brown leafs on them. I am feeding them 6 times a day now, before I was feeding 9 times. The roots are not brown or anything and I do not know what to do because the one has not even gotten any hairs turning color. I do not have mites, I checked that. Could it be the heat possibly? I have been away for a few days and when I checked the max temp that reached, it was 84 degrees. I need help. Also should I trim some of the dead looking fan leafs or just leave them?

You're at 7 weeks? How long is this strain. They look nearly ready.

Yeah its a long strain and they were stressed in the beginning when my light blew. I think one is almost completed but the other strain has all clear hairs so I figure it still has another 2 weeks to go. The leafs are starting to look worse though as time goes on. Should I flush them and see if it helps or drop the feeding back? I have never been sure on how often they should get feed with drain and fill. Ideas?