As someone in the market for a P100D, I am not sure I'd settle for a S100D. I am also not interested in AP/FSD, persay, so I don't attribute any value there despite both costing $$$. I don't drive much (no commute), and when I do drive it's not when everyone else is.
With that said, you asked what a fair price is and not what I was interested in. A fair price could be $70k. You have the car listed in a number of places now. Have you received any offers? I suspect no one has even offered $65k (yet)?
I would drive up and buy it from you, but we are way too far apart on price, and it's not exactly what I want. I'm looking for a P100D, and the last one I saw was a 2016, 30k miles, FUSC, FC, Ludicrous, MCU2, AP2 (I think...I forget) in just as clean condition as yours. That sold for $57k a few weeks ago...and it sold the same day it was listed (Craigslist).
I am sure if you wait long enough, whatever that translates to, you will sell yours for the $65k you were initially expecting.