After reviewing the contents of the thread, I wanted to pose a couple questions to Carthage (OP).
1. How many decks are you running?
2. Do you have a tried and true regular play group?
3. Of all the decks you have, how much variance do you see across the colors you're using with regard to card choice?
I run between 6 and 12 decks at any given time, but overall I've probably made more than 30 commander decks.
Not really, I've had a store group that is not fixed, and groups of friends that eventually stop meeting up over the years. Right now I have a sort of stable group but they have one deck each and the power level is very out of balance.
For the first few years of edh, pretty substantial. Lately? Almost no variance. Broken cards are stronger than general synergy, so the list rarely changes.