whats my problem? burnt tips

i have a lady in her 7th week flowering and has had a very hard life. I seemed to get everything mostly under control but I am confused about the nutes I am using. I have Fox Farms Tiger Bloom and Big Bloom. I am using at half the strength that the websites feeding schedule is and i still get nute burn. i think it is nute burn at least. do some plants just not need nuts? or should i not be using FF? here is a pic... nute burn or something else?

Doesn't looks like nute burn to me. And no, all living organisms require food to live and grow. Nutrients are food to the plant.

Looks great to me. It's nearing the end of its life and the leaves will yellow and fall off as you get closer to finish. Good Job!

but why the hell are these tips fried like this? if its not nute burn what is it?

Looks like a heat burn,I dont see any obvious sign of nut burn. just make more humid less warm environment (if its possible) and dont worry too much.

temps are not ever getting above 81

what ever it was it is not happening in new growth that is a good sign