One thing that would really help is if you were to modify the CVA breech plug. The standard CVA plug comes with a 3mm flash channel ( the channel right under the nose if the primer leading the the small flash hole in the end of the plug) This small of a tube does not allow the primer gras to move effeciently before starting to loose heat.

Think if it this way... go find two straws a fairly skinny straw and a larger one like for milk shakes.... Fill you mouth and cheeks with water... place the straw in your mouth and bow the water out of the straws.... Which straw more effeciently empties the water in your mouth? Now imagine instead of water you were blowing heat and pressure - which opening would get more heat and pressure to the flash hole.... Next step what if you opened the flash hole a couple of thousands - ????? See what I am working to.