Increasing the surface area will allow your tank to cool more, and evaporation will be higher. My old glass sump was 18" wide, and this one is 34" wide. It was 48" long and this one is 60" long.
I switched skimmers, from the single Mag 12 to two Sedra 5000 pumps.
I switched my return pump from an Ampmaster 4700 to a Little Giant.
From these changes, the tank cooled so much I don't even run a fan any longer, and the heaters come on daily. Unbelievable. The tank ranges from 79F to 80.5F with the lights on all day.
Hey, speaking of questions, you've not mentioned your rolling light rack since it was installed. Anything interesting to share, or perhaps modifications that you found necessary? Did it start to make any noise that might become annoying, or has it acted up in any way?