All help appreciated

Ok the plants are 30 inches tall and in the 3rd week of flowering. The temp stays 80 highest and 60 lowest but usually around 78. 400 w hps light and flourel in the middle. 5 gallon buckets foxfarm ocean forest soil and get fed ff bigbloom,growbig,and tigerbloom. 3 small fans for circulation and humidifier keeping humidity at around 50 percent and that was added a week and a half ago humidity was way low without it.
Was watering about every three days and up to about 3 weeks ago was feeding every watering but think it caused nut problems so have been giving just water and just now started a watering with very diluted feeding.PH just got tested for first time yesterday with a soil tester and read between 6.5 and 6.8.
The whole thing is in a closet about 4x4 and normal height. There has been alot of curling and some twisting ends and edges getting crispy dying some leaves falling off to the touch any ideas i would appreciate very much.Here are some pics.The yellowing in pics is mostly from the light but there is a very small amount of yellowing leaves and heres a link to the other thread i put up about it 2 weeks ago

https://www.rollitup.org/marijuana-plant-problems/315124-any-ideas-what-problem.html

Hmmm....looks like you have multiple problems going on, with the most obvious being too much nitrogen. It also looks like they might be going into nutelock, so it's a good idea to flush, giving them a fresh start. I'd also feed them after the flush, with some 1/2 strength veg fert. It also looks like you might have some PH issues, so you want to make sure everything is PHed before adding it.

Possible heat stress too, so make sure you're light isn't too close to them, burning the leaves.

yea, I think its a combination of problems. It could be over-watering due to poor soil mix (i.e. water pooling) but the soil looks ok.

But it also looks a little bit like heat stress in some parts. make sure you are positive the temp isn't going above 80. I've had the same problem with my grow box with the thermometer being in the shade, so I was getting inaccurate heat readings. To get accurate readings you need to make sure the thermometer is in direct light