Yet IF the intake system's intake restriction has been properly addressed, eventually the TB should become the weak point, correct?

I'm not sure how your dyno charts illustrate the efficacy of a larger TB for the M112K - isn't it more about measuring intake vacuum, where "less" is "more"?

While it would be a fair amount of work, it'd be interesting to see NW single CAI w/ 74mm TB, NW double CAI w/ 74mm TB, NW single CAI w/ 80mm TB, and NW Double CAI w/ 80mm TB - the first would likely be the worst, the last likely the best, but the two middle scenarios... who knows?