Your proposal at top does have merits. Perhaps limit the range to owned CP as like so many others, I rent a lot of the high-level CP cards. Another option could be to limit bouts to years of enlisting; hence, in my own case, years 2-3. In this way, we get to celebrate our own splintered "birthday" by moving up to the next year-level.

1. Count me in again, please. Many thanks - Ian. Hive account@ianballantine