I have continued to wear the gun/holster all day every day and the retention seems to have improved as the holster molds itself to the gun. It is still perfectly comfortable at the 10:00 position and I am really enjoying having my CM9 out front where I can see it and so easily draw it, even when seated! The holster is super stable; it doesn't shift around or up or down at all. The great clip makes it like the holster is bolted to my belt, and yet it is easy to put on and take off.
My shiny polished CM9 has found a new home! :D