Nirvana GSC Auto Early Season Outdoors

Crazy week in the garden. One of those classic early spring cold snaps rolled through and I had to bring all the girls indoors for a few days. You can see some early tomatoes that didn't fair so well in the background of some of my pics lol. Flower has officially begun and my branches are developing out nicely and fill in the space of the plant. Continued signs of nute burn and it's showing me some of the drawbacks of the organic method. When things are off I feel a little more at a loss on how to tackle it. Instinct tells me to flush...but I worry that could lead to depleting my soil's reserves early. I think I should have maybe used a thicker layer of soil above my hotzone layer. Tempted to try to gently correct this situation in my GSC 2 and 3 plants while they are relatively small still but GSC1 is gonna have to ride it out at this point. * No burn as of yet on 2 or 3. I didn't add extra soil so I expect some in the next week or two. Their growth has exploded in the last few days and I had to do some training. GSC3 is almost as big at 42 days as 1 is at day 66, which has me really excited about what it might do in more favorable conditions. After FIMing 2 I haven't done anything to it, looks like I got three tops on it. Might have to at least open them up some so they got room to thrive.