Your EC level is WAY to high. That was not any MG deficiancy or any other, that is classic nute nurn and nute lockout (and PH burn also..lots of PH burn on those pics which you are interpretimg as a defincancy). When you jack the ec levels like you did without waiting for the plants to respond, you get lockout which looks like a deficiancy, which makes the newbie grower add more and more thinking there is a deficiancy....classic
Your EC levels should go up SLOWLY during the growth period. You went from like 600 to over 1100....not good.....should takes weeks to get to that level going LITTLE by LITTLE...like maybe 150 jump in PPM at a time over WEEKS....not days.
You wanna keep your PH way lower, like around 5.5 no highere than 5.8 for hydro. Most of those nasty leaf pics are all PH burn/spotting.
You should have maxed out at around 1100 to 1500. What you did was not the way to find your plants limits.....
@tjo 4-2-1 ratio that i use is very close to your recipe and it is
the third weeks schedule of Useless formula (Google it "Useless formula")
The girls look VERY happy even with my large ph swings.