problem can't seem to fix please help

Growing a diesel Ryder its starting its 6th week. I have had this problem i can't seem to fix. I do believe its neut burn. And I have tried lowering the dose to almost nothing. And still seems to be burning. Temps are 82 day time 75ish night time. Humidity 40-60%. PH 6.3

Not really frosty yet

Not burnt. Nitrogen def. Mg def too looks like. A little yellow is common at the end of flower.

should i flush and continue 1/4-1/2 veg newts with bloom nutes ?