Sorry FTP, I was slow to respond. This is great information.
It is great pleasure to see an objective person taking great passion to explain the seat in a scientific way. My only minor quible is that when made at 5°, the new seat probably only allows around 1m45 (the official 1m52 minus the thickness of the back board. In a crouched position, I could still use these 1m45 to sleep on the side, eventhough I am 1m82.