hey I've got that same timing light. It's only good til 7k on CDIs where they fire twice. really nice for things that only fire once per rotation, like the Hall sensor a55 ignitions or Honda Dio stuff!
that being said...who knows why it isn't working? Maybe buy another one and try it out...see if it works.
from what I can tell parmakit doesn't make more than one of these CDI box/HT coil combos, so unless they started making them all without a curve, then maybe it's input voltage from the stator you are using?
from what I can tell these are made for use with their ET3 stator that looks A LOT like the late model tomos 4 pole CDIs
idk...this is interesting tho