Hello,
Well, you do need to bump up those basking temps to a range of 95-110 & make sure they are measured by either a digital probe or a temp gun for accurate readings.
The Flukers coil light is no good. You need to get a Reptisun 10 flourescent tube bulb. The best place to get it from is:
www.petmountain.com
It is much cheaper there than at the petstores.
The light needs to be mounted 6-8 inches away from him, & placed directly beside the basking light.
Also are you using calcium supplementation? At his age, he needs calcium 5 times per week, in conjunction with a good quality UVB light.
Tracie