The pace of the 12:10 bar to the 12:20 bar is 12,858 gain in volume from bar 12:10 to bar 12:15 and then 13,480 gain in volume from bar 12:15 to bar 12:20. Mathematically, this validates that the 12:20 bar did increase acceleration.
But I still cant figure out why the 14:40 is not.