It is Shimano, but it’s a GRX810 which hasn’t been shown to have the same issues as their other cranks - at least as far as I’ve seen so far. I’d be interested to hear if others are having issues with right side PMs on GRX cranks though.
Power meter reading difference – how to reconcile best between bike's power meter and smart trainer?
I am definitely going through the same issue right now. I have an Elite Direto X and a SRAM Rival PM on my gravel bike. With TR and my indoor trainer, my FTP is 233… but I have done 2-3 rides (about 2 hours long each) with my Rival PM and have had an IF (based on indoor power) of over 100 every time.
I have zeroed both PMs but still have a large discrepancy. No idea how to adjust for it, and it sure makes it hard to set a pacing plan for race day 