Odds are the alignment still isn't perfect. Here's a way you can fairly accurately verify vertical hanger alignment, though not twist. You'll need a small plumb line (weight on a string). Use the plumb to get the bike exactly vertical against the wall. Then shift to a gear where the RD cage is vertical. If all is right the upper loop will be directly above the lower since the sprocket and both pulleys are all in line. Check by placing the plumb line just touching the top loop of the chain just forward of the cassette. The lower loop should just kiss the line. A gap, or if it's leaning on the lower loop mean the hanger is bent out or in respectively.

As I said, twist is harder to detect, but you can get a pretty good idea by looking at the angle the chain meets the lower pulley in various gears. It will come from the outside in low gears, and the inside in low gears, and straight on in middle gears.