Slow grow and yellow tips

At 84 degrees the plants don't grow as fast as they possibly can. 76 they grow much faster. Much warmer than 84 and they will slow to nothing, unless your ppm is 1200 or more of c02 inside your grow. The burnt tips is showing you their at their max ec, any higher and things can go bad

Yellow leaf tips are a sign of either an overfeed or and underfeed but its only very very slight. its a common issue and I wouldnt not worry to much it will probably sort itself out if you keep up the feeding im sure you will be fine and if you have added anything extra too that feed it could be the reason for it but its a very minor problem and does not impact growth alot. the bud not being as big as the others will probably put it down to not taking up something the others are potassium most prob its probably nothing you have done most probably genetic. very impressive grow anyway my friend your going to have a very nice final harvest weight congratulations :) best of luck my friend :) 👊