Leaves look like they are "canoeing" which is usually a sign of a ph problem, causes nutrient lock out. High heat might make it worst.

Keep in mind that heat has an effect on ph, most calibration solutions have a chart for temp compensation, your readings may be off. Especially if you calibrate indoors in ac then read 90 degree stuff outdoors.

Not sure what to reccomend, I might try adding some dolomite lime to the soil around the plant and go alittle higher with the water ph.

Wish I could be more helpfull, tho I'm sure someone else will chime in.
Good luck with it.
oldmac Reviewed by oldmac on . WHY THIS ? (PH ?) ????????????? (pics) Could someone give me a hint as to what's wrong with these plants? I am relatively experienced but this is my first outdoor grow. Indica dominant bag seed growing outdoors in the California sun in regular topsoil. I always water w. PH corrected water and started some light GH nutes a couple of weeks ago. Soil PH is quite a bit higher than what's optimal so I keep the water around 6.2 to counter that a bit without going overboard. They have been in this soil for at least a month now. Rating: 5