Right now, I'm seeing him not dealing very well with the weight of expectations and additional pressure that came from winning the AO ... I mean the pressure to prove himself (and not asterisked) must be huge and he is losing matches he should be winning actually
To me, nothing has changed about Stan at all. He's always had the same talent level. That has neither increased or decreased. During this time I can only think of two matches in the past year that he's pulled out, Gasquet and Djokovic. Other than that, it's been the same old Stan.
And since, like you say, he doesn't deal well with expectations, I see him sliding right back to where he was before. The more they hype him, the more he'll disappoint.