Hay bro you have done a great job so far and you are not far from the end, you have done the right thing by flushing (when In doubt flush her out) ...... I think you have a magnesium deficiency due to the slightly low PH, calcium and magnesium are only absorbed above 6.5 so you need to get it up slightly. If you google search cannabis ph chart and look at the images you will see at what ph nutrients are absorbed.
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