[TheGrunch]

Looks good! Here's a speed chart for the K4 C3 1.98ata with MW-50 injection, with curves for both the 12159 (solid thin line) and 12199 propellers (solid thick line). As you can see there is no speed gain using the later propeller at sea level and then a gradual increase in speed gained (up to ~+12kph) above 2km.