Thats a pretty bad lighting system. While i 5.0 is fine since the cage is less than 3ft tall, however its only going across one 14" section of the tank. So 2/3 of the tank is getting no uv at all?
And you have tested the basking areas directly under the 100 watt bulbs only get to 85F? I find that hard to believe.
Finally, you are running at least 200 watts of bulbs for 14 hours a day. That is 1000kwh of electricity per year. At 10-20 cents per kwh, that could be 200 bucks or more per year. You might want to look into something like a 35 watt halogen flood and some under tank heat tape.