You've already gone way deeper on the numbers than I ever have. I've done a lot of testing with various barrel lengths, gas system lengths, reciprocating weights and spring rates, but I've never put a lot of time into studying graphs or doing any math to understand exactly what's going on.
The biggest takeaway from all my tinkering is that the shorter the gas system length the harsher the impulse will be. AGB's help tame a system in any given length, but longer will always end up more docile. Dwell time seems to have some effect on felt recoil. For instance, a carbine gas 16" barrel feels a little more violent (not taking muzzle blast into account) than a carbine gas 12.5" with all other components identical. Same gas system length, very different dwell times. But it doesn't work the other way. A 16" rifle gas may have similar dwell time to a 10.5" carbine gas but that in no way equals a similar recoil impulse.