Ca/Mg Problem?

At first the leaves were mainly yellow but with brown spots as shown in the 4th pic
now after adding some epsom salt, most of the leaves arent yellowing, but there is still brown spots that seem to be by the veins (pic 1). The third pic shows another leaf on the same plant that has a slightly different problem?
Ph is at 6.6, i use foxfarm and GWS...
ive tried this stuff called hygrozome as well
I run a 1000W bulb
Can anyone recommend what I do?
Im thinking of either trying more epsom salt, or adding some dolomite lime..?
 

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