Yes that seems to be a good likeness
Ok quick test, first thing was add a blended feed DRO to the screenset
Start at X10
FPR starts at 0.5 and as spindle slows gets as high as 1.3
Blended starts at 490 and remains constant
FPR Starts at 0.5 and as spindle speeds up it goes as low as 0.16
Blended starts and maintains 155
In other words its well screwed up and would be good to know if others get the same results with the same inputs with SS and PP.
Just did a quick test. Seeing similar behaviour here as well. Mach3 always maintains same mm/min feed and adjusts the mm/rev accordingly. The mm/min feedrate at which it moves corresponds to the mm/rev feedrate at the beginning of the move. This is with a Smooth Stepper.