First Grow Somango XXL

Trimmed my two healthiest plants, they're growth in the last couple of weeks has been astounding! My third plant is still showing signs of heat burn. I'm not sure why as neither of my other plants has shown any and they're all the same distance away. I've moved it around the tent every few days and had the wind blowing on it both directly and indirectly, nothing seems to be helping! It shouldn't be too bad of an issue as it still has good growth every week although it is visibly lagging behind the others. I've started giving all my plants "Kelp Me Kelp You" every nutrient feeding. I figured it may help my weak plant recover and the other two plants bounce back better from their weekly trimmings.