I have not read all the posts in this thread so someone may have provided similar info already. In any case, I want to report on my experience with recalibration and then testing against power meter pedals (Assioma Duos).
After I realized that my power output was inflated, I recalibrated the the bike. Instead of following the instructions in the manual (which I found too subjective), I decided to set my 100 level to be just shy of the rubbing sound that starts near the max resistance (during calibration, I hopped on the bike and pedalled while increasing tension. Once I increased it enough to hear the rubbing/grinding sound, I turned the knob back just a touch until I couldn’t hear it any longer. That became my new 100).
At that point, I still had no idea if the bike’s output was accurate and I’d fallen way too far down the Zwift rabbit hole of competitive racing to remain in the dark about this, so I ended up spending a small fortune on Assioma Duos.
After installing the pedals, I was able to compare the wattage of the bike vs the pedals in the Zwift device pairing screen. To my surprise, the calibration method I followed actually got the bike fairly close to being accurate (ie: the output from the Assiomas). Still a little bit off at certain resistance levels, but close enough that I probably would have been content to just use the bike’s power output if I had some other way to verify its accuracy!
So, all of this is to say, I invite you to use my own neuroses to save yourself the $$$ on power pedals. If you are content with your bike being within a fairly close range of accuracy, following the calibration method described above should give you the peace of mind that you are close to having accurate output.
Here is a link to the video showing the wattage comparison. Apologies for the shakiness—I made the poor decision of recording this after climbing Alpe du Zwift.
EDIT- The forum removed my Google Drive link. If anyone knows a workaround so I can post the vid- let me know!