No calmag at this point in flower, and I would only use plant specific calmag in my garden. I prefer to starve my plants during the last two weeks of flower, and only feed plain PH adjusted water. Since you are in soil, you don't need to worry at all about nutrients this late in flower, the plant will use up everything it needs from the soil, then start to use the nutrients stored in the leaves to feed the flowers, hence the color fad in your leaves. You are on the track, almost to the finish line. Start looking into drying and curing procedures, you spent a long time growing those plants, take your time drying and curing for the best taste and effect possible from your buds.