Mea Culpa.

I should have read the entire post, and looked closely at the photo's besides the one showing the mismatched curvature issue.

Your problem is that you don't have this derailleur put together correctly. The two arms have to go ALL THE WAY onto the pins, down to the body. That way the limit screws (both) will engage the cam rather than pass behind the arm.

If you can't get the arms in all the way, back both limits out of the way, and work the assembly back and forth against the spring until the arms bottom. Then it takes either a circlip or screw into the post to hold them in place.

Once you have it put together right, then you can recheck the angle issues, and deal with if necessary.