Cal-mag issue that won't go away

Just giving calmag doesn't make a calcium deficiency go away... you've got to correct what caused it in the first place .... for this little one, I believe it's caused by a nitrogen toxicity as your pH (which can be another cause) seems to be spot on. Once you get a lockout, you can give the plant the whole bottle of calmag and the plant won't be able to get it - because it's "locked out" ... So you've got to flush this plant. For you, growing in 5 gallon pots, that means running 15 gallons of pH'd water through her to get rid of the built up nutes and salts... into the final gallon, put half strength nutes... BUT I think you're overdoing the Flora Micro which has an NPK of 5-0-1 - NOT the NPK you want or need when in flower as it's VERY heavy on nitrogen.... so stop giving this nute at all to her (and I would suggest you at least cut down on it with your other plants in the grow). Plants in flower need a little bit of nitrogen but not much - and your other nutes are giving some to her... but the Micro is overloading her. After you flush, let her then dry out before resuming your water/feed/water/feed routine (minus the Micro!) .. things should get better. And btw, only give calmag once a week... not every time you feed! That can lead to still other problems! :-D The leaves that are damaged now will not be repaired so don't expect that... and you may see some residual signs of the deficiency show up in other leaves but it shouldn't be as bad as it is in these leaves.. and new growth should see no damage ... Good luck!