I gutted my family room in the basement and decided to put in 5/8". The problem I am going to have is in the hallway the 5/8" will butt up against the existing 1/2" drywall. At least it is in the hallway and the seam will only be 3' wide. But how do I work a little magic so it isn't so noticeable? Where the 1/2" ends I do have the access to maybe add shims to drop it down a bit.