OK. So I'm really confused if IAM corrects "instantly".
I reset my ECU and ran the car for a few days. IAM was 16 and Learning View was clean - no timing pulled. It was great.
Then I check again a few days later and IAM was 11 and timing tables show positive and negative values all over the place.
I assumed that was because the car took a while to "learn" that something was wrong.
If the corrections happen very quickly, that means the ECU detected some change after a few days, though nothing physical was changed in that period and I didn't drive any differently