i have some pretty high output lights
Please describe your lights.
You say your canopy is closed. Does that also mean you have a glass cover over your tank between the lights and the water? If so remove it. This will help increase evaporation and in effect help cool the water. Another thing to do is to install some cooling fans in your canopy. This will blow air over the bulbs aswell as over the water surface enhancing evaporation even more.
If you run a sump position a fan to blow over the sump.
All of this should allow you to drop your water temp a few degrees.