This should help (or maybe not...)
http://en.wikipedia.org/wiki/Climate_of_Ghana
Record highs for any month never go above 90 degrees. Ever.
I am also one of those who keeps my temperatures lower than what is typically recommended because experience has shown that in my situation that is what works better for me. If keeping your temperatures higher works better for you, then by all means use them. Just be careful not to cook your snake. There are many paths to success, don't be afraid to experiment and use whatever works best in your situation. Listen to your snakes and they will tell you what they like.