Now I know why I stick with using Good used Stock OEM GM HEI distributors. That I modify to get the curve I want.
I have never had a problem getting a smooth consistant advance curve. Usually using the stock OEM weights and just swapping the spring and establishing the mechanical advance limit with the machine head screw.
The stock weights and center piece usually allows a 20-22 deg advance curve.
In your pictures the advance weight appear warped......