Hey, this is the power curve we have at the moment, this is a snapshot of the aircraft at 25" or full throttle, and 2500rpm and 20°C Rich of Peak with 1542kg average cruise weight.
As you can see the power does fall off slightly more that we’d like from around 13,000ft but overall from sea level to 16,000ft we are just 0.22knts and 1g/h out from book figures. These are average numbers after 10 runs.
What power settings were you running? Prop settings etc?