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Flushing soil is an absolute last ditch effort to get a nearly dead plant across the finish line. You are not there.I have the understanding the runnof reading from soil can be very misleading and flushing soil most of the times will make the problem worse with soil.. This what @Mañ'O'Green said about flushing but he may have changed his tune since
"OF is Soil and you cannot successfully flush soil it often makes matters worse. Soil has elements like Dolomite lime and other rock hard sources of nutrients that the soil microbes break down into the ionic forms the plant can uptake. Flushing washes away all of the available soluable nutrients along will most of the living microbes but leaves behind the solid forms of nutrients totally out of balance. You have no way of knowing what is in the pot and no way of determining what to add back in to try to get the balance back. You simply do not have enough time to get the soil healthy again before the plants are done. "
That does look like a Mg problem but the cause can be mysterious. If you are confident that you are not overfeeding then add 1g Epsom Salt per gallon to your regular fertilizer (mix in after part a, before part b in a two part system) It will not repair the past damage just wtch the newer growth for it to stop
