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I think you get a Power Balance across the spindle. Which doesnt need to be 50/50. But if you ride happy at a certain Balance. Mess With in-soles and both Your happiness, and spindle Power Balance changes. You have a decent data to try and fix it.
My mate builds up the inside of his right shoe at the Arch. When Garmin rolled out this data with a recent update. He found his feet to be different. He aimed for perfectly balanced on the right foot. But that caused pain. So he dialed it back. So I think you need a known 'happy balance' to work towards.
Smallfurry-
Very interesting. I have funny feet, right foot has a high arch and left low. I can go a month being perfectly happy with the custom insole setup I have now with no pain, then all of a sudden I will get arch pain, so I will change the arch to a different setting, pain goes away and I'll be happy for a month again. Fast forward another month and it will happen again and I switch back. Really quite bizarre. Maybe it's just environmental factors.
Hovis
So they can be used to determine if your insole setup is appropriate?