that most definitely looks like chronic overfeeding. pour a good amount of water through the pots, at least 4 times what the pot holds, and do it slowly, don't just dump it all in at once, give it time to leach out the salt thats built up in the bottom of your pots. from now on when you water, make sure you're pouring in enough water to get a little to come out of the bottom, and about once a month pour an extra gallon of ph'ed water through them all before you feed, to avoid this in the future.
i've found you hardly ever need calmag in soil, only use it if the plants are showing signs of deficiencies, usually little reddish "freckles" on your leaves is the first sign of cal deficiency.
i'd feed once a week, water with ph'ed water the rest of the week, if they seem to be wanting more, you can bump it up, if you give them too much, this happens