whats your temp running in there? what kind of air exchange do you have? by your pics it looks like its way too hot. hence the cupping of your leaves. if your going to run air temps over over eighty five degrees, then you better have a fan blowing on your plant as well as constant air exchange because at temps that high the plants are respiring(breathing) much more. do you mist your plant in the morning to simulate dew? do not worry about burning your leaves from misting with the light on. it is a myth. i mist my girls every morning under 1000 watts, never had a problem. misting helps keep stomata on the leaf clean and open so the plant can rid itself of toxins. hope this has helped you.