I recently bought a stages power meter and after riding it and looking at the data I have noticed there is ~a 40 watt difference between indoor trainer (Wahoo snap) and Stages, with Stages showing ~ 40 watts higher.
I conduct spin down and calibrate the stages power meter as appropriate.
My concern is that when I ride outdoors, the difference between the power meters is creating chaos with my training plan as TSS and IF scores are not correlated.
Any ideas on how I can accommodate the differences into my training plan?
Yip use power match but you’ll probably still find to some degree that inside and outside power are different. Most folks outside FTP is a bit higher as they benefit from air cooling. I actually find that my inside power is usually higher as I can switch off and go into the zone without having to worry about crashing etc.