I have a conundrum. my stages sb20 reads a consistently lower power number as my outdoor bike’s power meter. Since it is consistent, the indoor training went fine.
however, no that i am transitioning to outside, i am getting red days after workouts when i really wasn’t stressed terribly hard
Not sure what to do and how to resolve this. todays workout which was somewhat based on steamboat was a solid sweet spot effort but due to the meter issues it registered much harder than that
pretty significant. a good 20 watts. Enough that TR AI thinks that i spent most of my time @threshold
If the offset is consistent I wonder if you could game the smart bike by manually adjusting the crank length until the power is closer to what you get outside?
Are you 100% sure it’s the power meter?
It’s a pretty well known phenomenon that outdoor and indoor efforts are different for most cyclists.
Intervals.ICU let’s you set an indoor FTP.
“As we touched on earlier, most riders will produce more power and record a higher FTP on the road than the trainer.”
What is FTP and why does it matter for cyclists? | BikeRadar.
I’m not sure how true that is. There are lots of factors, but I’d definitely start with the power meters - the Hunter Allen article you linked touches on this under Calibration as a precursors to all the other factors.
I have a similar problem when I go out on MTB (left crank powermeter): the power is slightly higher than my Zwift Hub and even my road bike Favero dual. In my case I think it is because my left leg usually produces the 52-55% of power.
I usually avoid to do important workouts on MTB, but is a bit annoying, because I train for XCM and I need to spend time on my mountain bike!!
But in the other side, I don’t want inaccurate power activities on my Trainnerroad…
Not easy solutions… Well, change powermeter to a more accurate one?! 
You’re really going to try to refute the guy who founded Trainingpeaks? Let’s hear your argument.
Wouldn’t the simple answer be to set your FTP 20 watts higher?
You already have, and it’s in his article - I’m pretty sure my post was very clear on this.
Some PM software have an “offset” function. I know Sram/Quarq has.
If that’s not the case. Another - annoying - alternative would be:
a. identity your PM standard and the offset % you need.
b. use a tool to edit your activity. Intervals.icu does this. It will be annoying editing your activity and re-upload it.
Since you’re using a dedicated indoor bike, I’m not sure of a simple solution here. 
Can I assume that you’re using the Stages app to check firmware and calibrate your SB20 as often as recommended?
What about for your pedals?
It’s tough to find a way where this works well with the software if you’re significantly overshooting the power targets when riding outside, but the intervals are appropriate inside.
An accurate smart trainer would be a good, easy option. 
I’ll dig into this a bit more and see if I can find a solution of some kind, but if the discrepancy is as large as it seems to be and things are all calibrated as best as possible, there might not be a cheap, easy solution. 
thanks for looking into it and asking at home base
for now i am just ignoring the adaptions and hoping AI will adjust to the higher power of the outside workouts
we shall see
Stay in touch and let me know how things go.
I’m here if you need any help! 