I don't know about the lighting but I am guessing the droop and discoloring of the leaves is from the Grow Big that you added. I made the exact same mistake when my plants were that size and almost fried them up. Stick to water for a few days and see if they pop back and recoup as they appear burned. Best advice I got on this site is to not over complicate and just keep it simple. Make sure to only water when they need it too.
Looks good beyond, excited to see how it comes along in its life.