Any pesticides? Foliar Feedings? Urine Showers?
What is the Ph of your new mix?
Ima going to say with the upward canoeing and curled up leaf tips in week 4 of flower could be a Cal-mag deff. with some locked out P & K .
My first gut feeling was cal mag. Epsom salts...tiny bit wont hurt. I am not sure what ph would inhibit the plant from recieving it. Remember. I was told to adjust ph sloooooowly. How long do your plants take to see the results of the mix. Could you have nute lock. Have you flushed, watered from bottom or top down? Whatever the opposite is you are doing? You know better than I, are all your plants responding the same
That looks like cold shock to me, how cold has the nights been lately ? Not sure but it looks like it !i
I use 1-2 teaspoon per gallon.i was thinkin that, i know my water is a lil rough. how much epsom should i use to a gal?