It's perfectly normal- usually if he's too cold he will be less active and eat less-and will have darker colors (at least that is what I have found in my limited experience) you could try moving his bulb a little closer (not close enough to burn him see above) if you notice any of the above or going to a slightly higher wattage- but your temps are good - he's getting closer to being an adult and may like it a little warmer (a degree or two)
Baby/juvenile (<9 months): ambient 72-80F (22-26C), basking 85F (29C)
Adult males: ambient 75-80F (23-26C), basking 90-95F (32-35C)
Adult females: ambient 75-80F (23-26C), basking 85F (29C)