So, looks like I've finally got good numbers. It's hitting about 91% VE at peak torque around 4500rpm.

rpm, g/s, ve, theoretical load

4535, 70.00, 91.55, 79.65

4486, 68.38, 90.41, 78.66

4520, 69.75, 91.52, 79.63

Thanks for the tip on how to measure! ... Login to read more.