Hi..
Well it looks like your exhaust of your light goes into the wall... I would def change that.. I would also put your AC near the top and have that kick on before your lights start than.. With that being said, your room will balance more in a temp when the cold air exchanging with the hot air raising. Trust me on that point.!!! For several years I always pumped by fresh air in at the bottom- well not no more!! I can keep my temps about 3 degrees color by eliminating the hot air.. I do this now my fresh air coming in near the top of lights..
In that pic, it looks like your drew an air cool shade-is that true? And still heat issues?