Yes one is smooth and yes ditch the ring on the other. I have painted over powder coat and it worked fairly well. Your calipers will slide nice and free.
Power stop is very good! Have power stop stuff on mine no complaints.do your a favor and ditch the rings on the ends of the slide pins.they cause more problems than anything. They cause the binding issues and cause uneven pad wear.
As long as you had the staggered wheels on when alignment was done,no issues. Just need to do something about the camber in the front. If you didn't have the staggered setup on when the alignment was done that would be a issue.