Ok, I switched out to the pietcard 01 purple coil w/2013 using a cev magneto/flywheel. I did this for pat norris so he can see the ignition curve.
It looks like (didn't measure) a good 3-4mm retarding the correct direction we need to throw the heat into the pipe. I have the stator plate turn as far as you can turn it. You install the purple coil after you mounted and tighted the screws on the stator plate. That is the way I did it. The engine is running the athena/euroclindro 47mm kit.