Well, I didn't want to be P-I-A since I got mine replaced with a new one already because of not flush problem. It still seems to have a problem with a right side, but I decided to take a look at it myself, by removing the screw and lifted the screen with suction cup......
There is a rubber seal around the screen that makes it tight and stick to the frame. Also there is a small ridge where screen sits. The ridge must be lower than where it should be (QC problem maybe?), because I don't think we will have this problem if the ridge was higher.
Anyway, I don't know if the frame and the screen size mismatch is the problem or not, the screen will get pushed down lower than border if you give a small force....therefore If you give a little squeeze to the frame and set the screen slowly....it will get to the point where the screen is flush. I did this and it seemed to fix my screen not being flush with right side. Now it is much better and it feels the same as my original iphone.
I have an 2nd appointment with Genius Bar for this problem, but I am going to skip it and see what happens with this phone as I believe we are covered for a year.