I also put together a custom built pocket door installation at home. Two french glass doors that met in the centre of the opening. Since the house wasn't perfectly square (whose is?) and I needed to make the doors fit evenly at the middle I used the felt tape stuff you put on the bottom of furniture inside the jams to shim the doors to where I wanted them. It comes in different thicknesses and I cut it so it is not visible unless you look really close. It seems to be staying on well, provides a bumper type surface and doesn't scrath up the doors. Worth a try.