Here’s an issue that I don’t think was addressed, did you do something odd with the solenoid associated with the secondaries on the stock GSR intake manifold that your new AEBS mani does not have?
Agreed about going huge not helping power but it generally it is not going to make it run noticably rich, especially not super rich as he claims its running. Also, unless the AEBS mani is a good bit different than the last one I saw (I admit it has been a while), the AEBS is very similar to a stock R intake and the 65mm TB isn’t really anything huge either.