This is the first time I have seen anyone ever say this. The lose of power is most likely not due to the CDI derestriction. Unless of course you did the derestriction wrong.
The problem is most likely something mechanical not electronically like the CDI. Check your valves to see if they have the correct spacing and check your air filter to see if it is super dirty. Also if you have not done any tuning to your CVT that will make your scoot seem slow. Also a quick clean to your CTV does actually show nice improvements for me.
Let me know if any of this helps or if you have checked all of that already before you go buy a new, possibly unneeded, CDI.