I have a PSA 16" M4, with the Vltor a5 system installed, with a Springco green spring and running the A5-H2 Buffer. When I run m193 IMI the ejection pattern is around 1 o'clock, if we run any standard 223 ammo like Wolf steel case the pattern is normal around 3 to 4 o'clock, We have tried a new Wilson Combat complete BCG, and have changed out and tried all Vltor A5 heavy buffers with no change to my pattern? what is going on?