I use 80-82 with a chiller. Most literature out there will tell you anywhere from 74-79, which seems odd to me since this is usually the low end of most natural reefs. Some reef waters of the indo-pacific can reach the 90s.
Keep in mind, disolved O2 and disolved CO2 will go DOWN as temps go UP. CO2 is no big deal since higher CO2 tends to drive down your pH. O2 levels, of course, are very important though. This may be why so much literature recommends the lower end of the natural reef temps. (to maximize O2)
In answer to your question, if your livestock is happy I would be hesitant to change temps. If you want to try something different, change slowly and see how it goes over a week or two. Find something that your happy with that makes energy costs something you are happy with too. THAT would be where I would keep mine... Hehe, that's exactly why I do 80-82. Minimal chiller run time with the results I want.