Heat stress,nute burn,ph lock up ?

I originally posted pics of the plant and was told it was nute burn flushed the plants used less nutes and it still looks the same. Every new leave gets yellow end at the lead and then browns. The main leaf in the pic is blackening and looking gray.

I am using a 27 liter container and am using fox farm growbig fertilizer the ph everyday I have to add more ph down because the ph rises I think the plant is causing it because even after i flush it still rises after I add nutes. I am flushing now should I wait 2-3 days before adding new nutes to the plant?

Looks like it can still be couple things
what do your roots look like? what are the room temps and how close is the light?

I think it was the roots as you can see im using clay pellets the picture of the roots is after I pulled like 13 pellets that were stuck and rapped around by the roots. Room temp is around 87-ish and the light is around 3 feet away. I really do think it was the roots How can i avoid the roots getting all cramped up with the pellets. I have read clay pellets are great and havnt heard anything bad like this about them. I am using a bubbler like the one out of YouTube - Grow Cannabis hydroponically By Eatspam & Raven from eatspam and raven with minor differences.

I re potted,flushed and am going to foliar feed a little bit of superthrive for a few days until i can ad nutes.

Its fine for the roots to wrap around the pellets, that's how roots grow. you should put it in the pot and cover it with pellets so light doesn't get to the roots.
The roots look good, but don't keep pulling them out like that cause it puts stress on the plant.
So it sounds like it's a major heat issue, you need to get the temps as close to 72f as possible. cause it's way too hot right now. and are you using a fan to blow on the plants?
and what light are you using? 3 feet is very far away, you shouldn't have any light further then 2 feet

Yes i am using a fan to blow on the plants, I am using a 400 watt mh/hps and a couple of fluros for the sides. Theres no way for me to really lower the temp lower then 80s as im growing in a closet.

then you can shut off the fluros since their not helping the situation any and it should help the temps a bit. But you need to do something to get the temps at least into the upper 70s.
get the 400 down to about 20" above the plants, you should consider a cool tube to get rid of all the heat from the light

I just added a big ass fan to the back of it, I highly doubt I will make it to the 70s in there I already have 2 fans blowing out the back side of it as as well as an inline fan blowing the air from the light outside the closet also. 70s in a closet is just not possible with out having more then 3 fans and then that would really just defeat the purpose of the closet really.

looks like nute burn....

It looks like nute burn ? I already flushed them before and they didn't look any better.