I have the best ignition I have tried to date for my requirements and it is a Flamethrower III unit in a factory points dizzy.
I did not do what you have shown us however! My factory ballast is bypassed by soldering in a solid #12 copper in place of the compensating resistor behind the ceramic housing. I wonder how yours is wired as it seems you may have a double voltage drop to the coil depending on how it was done. We need to see more info on how the second ballast was fed!