If the clip's moving/shifting, you should examine the size of the opening and ensure your belt fills it.. These belts from Rosen are 1.5" wide and trust me - nothin' moves on these things..
The tuckable clips I have used do not go on the bely but stay on the pants under the belt for better concealment. With the VM II and the optional clips my carry is completely invisible if my shirt is bloused just a little bit.
