It's either to cold or to hot wind burn depends on strain some strains are very sensitive to change in waters it's best to keep consistent you might not trust me but inorder to break down salt use a lower oh example 5.8 5.7 water to break down salt no nutrients tho has I be only filtered water...
Nothing be patient
Water lightly
More water doesn't mean itl grow faster
Turn on a fan near not to close to the plant so when it dnces itl have a stronger stem
You say your 4 days away from harvest my suggestion would be to vent out the hot air turnn off lights for a day or 2 . Turning the lights off a day or 2 before makes the turps come out more for better bud. Deleaf lightly and harvest . Dealing with heat in the room and not being able to...