Another nicely written chapter, but please be careful as I can clearly see the makings of a Mary-sue on the horizon.
Please don't "crank the power to 11" so to speak immediately, I've always found that it tends to spoil the story more often than not.
Author's response
I will try my best to keep Harry believable. Canonically, he is very powerful, as witnessed by his use of a spell in his third year, which is supposed to be so difficult few adults can use it. There are other references, but that and his summoning his broom from over a mile away indicates he's something to be watched.
His only problem with power is his lack of studying, which I can lay at the feet Albus Toodamnmanynames Dumbledore through his 'best friend' Ron, who has ambition but no drive.
It also stands to reason that his magic has been bound. In canon, Dumbledore has shown no compunctions about abusing Harry...through proxy, of course, and binding his magic, is well within his character. It would also prevent him from performing well unless he really needs to.
He's going to be doing some impressive things, but he is now in possession of a branch of power he never had before. To others he may seem to be horribly powerful, but only because he can do things with the force that they cannot.
Alorkin