Ic , Foliar spraying early in the day (about 15 minutes before your lights normally turns on) on the undersides of the lower leaves shouldnt be a problem. I only suggested that way because the micro-nutrients would be available to the plants right away and it wouldnt affect your soil's ph and the plants would have all day for the moisture to evaporate. Im glad there showing signs of recovery! Another feeding with mild epson salts shouldnt hurt but be cautious dont let there be to much buildup. You might even want to wait a few days back to your normal feeding scedule and then give them the second dose of epson salts. Glad I could help. And ill be watching to see these girls harvested.