No it wouldn't be sour. Malic acid is the main acid in apple cider. If its gone the cider loses its natural bite. You could use an acid blend or malic acid if you could find it. But I would say taste is first and see where its at and adjust to your taste if needed.
That's the method that I use, but don't add any honey at the beginning you can get a 5-6% depending on your OG. Just don't use 71B it will ferment out the malic acid leaving the cider flabby (no acidity). Just use a standard ale yeast.
Yes OneHoppyGuy is correct.
Then buy yourself one of these adjustable regulators.
http://kegcowboy.com/index.php?dispatch=products.view&product_id=337
I had issues with my regulator that came with the stand (too much gas), this one solved my problems.