First off, welcome to the club. You seem much like me in the want/need to modify classification of owner/riders. Always a way to improve something.
The CDI "upgrade" is something I have been doing a lot of reading and research on, and I have come to two conclusions.
1. Almost all of the "high performance" CDI boxes that advance the timing, advance it across the entire RPM range, and do not have a curve. This means they are advanced even at idle/Start, and thus making the bike much harder to cold start. Most testing I have seen, when compared to a stock CDI, shows almost the same timing and curve beyond 3000rpm - making for little to no increase in performance except at lower RPM's.
2. The best 2 options are either a CDI with a programmable ignition curve. The one I know of was linked by JerryHawk, and is $80 through Aliexpress ( I will link below ). The other method is essentially free, and simply requires slotting the pickup's bracket holes to be able to manually advance it. This method was tested against all of the "Performance" CDI's on a GY6 scooter, and plotted out showing a better/similar curve to most of the "performance" CDI's, while also maintaining the low RPM ignition retard to allow for better starting.
Here is a video showing a similar comparison.
Programmable CDI.
https://www.aliexpress.com/item/Digi...460.0.0.xxJ8G4