If you've flushed your plants (3x the pot volume of water) and didn't give them any nutes at the very end of that process, then as soon as they're dry, give them a 1/2 strength dose of the nutes you were using - cutting the Grow Big down even further than that. I used to use Fox Farm and it's the Grow Big that was the culprit each and every time I had a deficiency - it's got WAY too much nitrogen in it. Going forward, if you don't want any furthe problems with your grow, you've GOT to cut Grow Big down to max 1 tsp. You can increase your Big Bloom and add in Tiger Bloom as well... and any other PK booster you might have as this is what she's really needing at this point.
Good luck!