I think Perk is progressing fine.
He is still young and you can see progress every year in the league.
Last year he started to hit that fadeaway some and while a little flat, he showed nice touch when he did get if off.
He also showed some hook last year and improved upon it all year.
Towards the end of the year he was starting to hit the 10 to 14 foot jumper with good sucess and nice touch on the shot.
He even showed some of the ball fakes that jefferson uses, and to some degree sucessfully.
The fact that he is using these in games now shows that he has been working on them on his own.
I expect his instinctics to improve with more use of these different shots.
Now don't get me wrong, I don't want him taking 15 shots everygame or in very many for that matter, but his offense is comming around, and he is still learning.
So until I see him level off, I have expectations of him being a top 5 center in his future and a defensive force as well. There are matchups where going to him will make things easier.
He will be nice to have when the big 3.57 retire, to go along with Rondo.