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My experience has been that once the learned value is off that no amount of driving will correct it. That said swapping the ECU to the other car and back did reset the values instantly but I'm not sure if it was from being put in comms mode or from swapping into the other car. I never used techstream to update the vin so it wasn't that.
I would try putting it in comms mode first and see if that does anything to the initial learning positions table. Disconnect battery, reconnect battery, loop OBD pins 4 and 13, turn key to full on position, wait 30 minutes, turn off, remove loop, and turn on for a couple minutes and see if the values have changed. Don't forget you'll need a strong battery or a tender.
If that doesn't work, between the battery connections, I would place your ECU in another car. Mine had an ecutek tune so I flashed to an OEM rom before I did so. When we reinstalled the other car's ECU after we were done we still did the comms mode steps both when installing their ecu back and when installing yours back in your car.
This should only help with the learned values though if there's something actually wrong I'm not sure it will help. Techstream is pretty good for playing for the angle to test response though.
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