The wedge problem is not a problem. You will develop an understanding of how far the wedge needs to be pushed into the pistol for proper operation. Barrel to cylinder gap should be a little less than the thickness of a credit card. (Now I gotta go measure a credit card to see if that is really right.
For the second problem read these articles:
They will give you an idea of why the cylinder is off. They don't address this specific pistol, but the concept is the same.