what kind of power readings are you seeing with the motor off? say, riding on level ground at 16mph with little wind and a steady HR in the 90-130 range?
my conclusion after quite a bit of mucking around with the data was that with the latest firmware and the motor off it was within 10%, but somewhat dependent on temperature and left-right leg balance. i pedal about 15% harder with my right leg (my balance shows up as 46/54 on a dual sided PM, on average) and so far the bottom bracket based PMs i’ve seen don’t quite get the total power right. if your output is more symmetrical and you have less temperature variation i’d guess you’ll be more like 5-10% off, but, again, with the motor off. i would have thought the clutches in the motor would prevent the motor torque from influencing the rider torque measurement, but that did not seem the case on my creo. maybe it’s the heat of the motor, which would jive with other variations i saw.
