i have "somewhat" followed your plight of a poor appetite in your dragon.
I too got a dragon from a great breeder. Beautiful little boy it is, too.
He also didn't have much of an appetite. He would eat, just not with much gusto....and just not very much.
Well, my instinct told me that he might very well have a high coccidia count, and i took him to the Vet.
I was right, very high coccidia count, only 2 weeks after i received him. The stress of shipping and a new home must have set the infestation off.
Thankfully there was absolutely nothing else in his fecal, only the coccidia.
He just finished treatment with albon, and i'm giving him probiotics for another 3 days.
His appetite has gotten much better, although he is now spoiled and prefers his food "handfed".
LOL.
He has now finally gained quite some weight, and is catching up to what is considered a good size/weight for his age.
I know beardies take a while to get used to a new home, and might not have an appetite because of that.
However in your case i would make a Vet appointment asap, if nothing else, for your piece of mind.
After my experience i suspect, your dragon might have a parasite problem.
The sooner it gets detected/taken care of, the better.
Just IMHO.
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reps-r-us