Sour diesel issue with leaves curling

From a fellow grower: strain is sour d, type fem. climate indoor, hydro,rockwool, ph 7.5, floral series 1 teaspoon per 1 gallon of h20, 1,000 watt sodium bulb, temp. 78° humidity 72% ventilation is a 12" osalating fan

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Ph 7.5 seems high for hydro, want to be in 5.5 - 6.5 range, with around 5.8 being optimal. Leaves curling could be from light stress, try raising the light or dimming.

PH is definitely high, probably too much N.
Hope this helps!