Hi. You're right, a beardie that is only 6 to 7 mo old. How is his appetite?
Sounds like the temps are off. I know you said the hot side is 100 but what is the actual basking SURFACE temp and what type of thermometer are you using?
Also, what brand & type is the UVB, how old is that particular bulb & what is the distance of it when your beardie is in the basking spot?