Yes, you likely recognize that I attempt to use the 104-week and the 208-week moving averages to account for BTC's inevitable volatility, and there could be some other ways to account for that too beyond what appears to be your merely moving the 25 years up to 30 years.
Yes, I see that quite often. Have you got a simple website to pull those 104 and 208 WMA numbers? When the 208 WMA is 25x your annual expenses, would surely be a good time to pull the FU lever I would think, as the spot price is probably a lot higher. Then you can simply cash out once a year without thinking about the spot price, as your WMA is always going up anyway.