Hi, glad he liked his applesauce. Indeed, if he's cranky, keep the handling to a minimum. Is he often cranky, or is the new behavior?
At 8 months, dragons are still considered "juveniles" so yes, I would try to get the basking temp up more, to like 105-110. At about a year to 18 months, when he slows down on live feeders/protein, you can lower the basking temp to an adult beardie temp of 95-100.
The best, and keep us posted.
Em