From the description I was expecting a LOT worse. That plant looks healthy, if a bit scorched. VERY slightly.
When you've got problems, there's a form at the top of the problem section with info on your conditions that you can fill out for MUCH better answers. Just copy and paste it into this thread.
Edges curling up is indicative of heat stress so raising the lights was agood move. Also, heat will make fertilizer burn more damaging to your plants.