Here is the Slope of the SOH curve before the LBC update = 5.8% per 10K miles.
Slope of the SOH curve since the LBC update = 6.6% per 10K miles
Note that the SOH curve for after the LBC update does not have very much data
and likely overstates the rate of degradation as it includes August and Sept which are warmer months in Seattle and i think the slope is higher in warmer months.
It appears to me that the rate of degradation may well be unchanged from pre- and post- BC software update. If that is true it might be reasonable to estimate 5% or 6% SOH loss per 10k miles given my driving habits.
If I'm at 88% now it seems like I'll drop 22% in the next 45k miles which would put me at a new battery at 85K miles and 2nd life. I think I'll keep monitoring this and make a determination about what to do at the that last minute before I turn it in or buy it.