Interesting work, horseback. Is your feeling that acceleration is tied directly to, and only, drag? The reason I ask is because blade pitch was another major factor, in that as it increased more thrust was diverted from forward propulsion to resisting rotation. The result would then be a much faster drop off of acceleration at the top of the scale than the simple increase of drag. Curiosity only.

As for the 190, you're right, the trim in the real plane wasn't anywhere near twitchy and, bizarrely, the faster the plane went the less adjustment it needed for speed's sake. Above 260mph no adjustments in trim were needed at all if the only variable was speed. Sounds like you could use that characteristic - lol. As to its in game takeoff acceleration I've done standing start drag races between an absolutely empty (no ammo, 10% fuel) A8 closed cowl flaps (and auto prop) and an overloaded (1600lb, fully fueled) SBD with canopy and cowl flaps open and to 100mph it's practically a draw! lol. Fun times.

--- Trivia: Lowest drag D9 cowl flap setting was 23% open. ---