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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-
Sounds like none of Your set-ups are working 100%. But by rotating them you move the resultant stress point around. So you get to start a fresh each month untill that stress point developes into a niggle.
The question is, if you had the Vectors, and they showed a change in the foots pressure across the spindle, during the month. Would be which comes first. The niggle, or the change in pressure.'
Smallfurry
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.