My engines are only 4 hours Total Time, and I know how they feel when running at various speeds, so if there is any change, I will notice it.
Unfortunately I do not have an rpm on them, but it sounds like you will have this well in hand soon.
I'm expecting the change in smoothness to be dramatic at the low end of the RPM range, since I believe most 2 cycles are tuned for the high end.
The ignition advance/retard should make an obvious difference.
The new armature plate, being identical to the original has the same location for the lighting coil, so you would simply leave your existing plate, and lighting coil in place and substitute the new stator coil for the original black ignition coil. You will still have the same red external connection for your RPM gauge.
The black connector can be left in place as well, but you need to route the ignition kill wire from the CDI unit to this plug.
I tried to read the Ducati part number, since the sides of the aluminum shield are open, but the angle is to sharp to read, so I will take the unit apart, take some pictures, record the model number etc and post it to this forum.
The hard part will be to determine what the coil is, since it has no model/manufacturer markings at all.
From my understanding of the subject, the coil generates a voltage that is amplified by the CDI/Coil unit and also triggers the firing of the spark via the CDI electronics.
Timing is set by rotating the armature plate slightly.
Here are the instructions(right click and SAVE AS on the link): CDI Timing
More updates to follow soon.