Well maybe, look , the distance of the tops from the light is exactly 1 meter , I run a 600W hps and temperature at this spot of the leafs and in that area in general is 24-25° and tent temp is 25,5-27° Celsius during "daytime" . Does that helps ?
EC is around 800 and PH I set it at 6 when I make the mix with the nutes in the water tank but one day later is around 7.
Btw I'm growing shoreline from Devils harvest in that growing module which are quite hard to grow for me and picky with the nutes.