One thing I just thought of if you're looking for the official start/stop points for the Ring is to maybe go check out where Gran Turismo or Forza has it at. They may be video games but they are pretty adamant about getting every little piece right, especially on the Ring.
The only question I have Travis is: you started the timer at the forward mark right before the first turn which I know to be correct, but isn't the finish there also? You ended the timer right after the last turn which is like 50-100ft before the start point. That's actually what I specifically remember from playing Gran Turismo so that kind of calls into question what they produce, but they have quite a bit of experience on this track with how much they study it. Aside from that I'm sure there's plenty of other sources but I think that's why there's so much controversy over Ring times.
I like that Ford tests there but doesn't advertise with it. As of lately Posrsche has veered away from pushing their times because it's been so overhyped. It used to be one of their things but then everyone joined in and Chevy raped any validity it ever had for their own marketing so Porsche has steered away and Ford just stayed away. It's sort of a hipster mentality but it's the truth. Chevy brags they are the fastest while the other manufactures know even if they have the fastest time it will only be short lived because there will be something better and faster, so when that time comes they're going to name your car as the car that was dethroned which equals bad press. Let GM play in their own little world and just keep your shit on the downlow and let the cars speak for themselves at the track.
The only reason the hypercars use the Ring still is because no one can play on their level and the cars are so highly engineered and unique that no fudging needs to be done. Regardless of Ring times people will still buy the P1, La Ferrari, 918, Huyra, and Koenigseggs. The times are posted for the sole reason that these cars are the pinnacle of engineering.
I based the start and stop points off the Chevy vids and talking to people who have been to that track for runs.
Sid, any idea on Boss 302 LS times?