You know when the Pet Audio Rock dude responds to your posts with ad-nauseum posts that have nothing to do with the topic and carry no relevant content that you must be doing something right.
George,
In my professional world, when you do something and get results that differ from people who have spent extensive research time on a topic, the normal inclination is to assume you have done something wrong, or assume there is something in your setup that you are detecting, that was not what you intended to measure. In this case, a low distortion microphone setup could probably reveal what was wrong, but I don't see an indication you have done that. If you are not willing to consider that something is wrong in your setup, then you are unable to fix it.
George,
In my professional world, when you do something and get results that differ from people who have spent extensive research time on a topic, the normal inclination is to assume you have done something wrong, or assume there is something in your setup that you are detecting, that was not what you intended to measure. In this case, a low distortion microphone setup could probably reveal what was wrong, but I don't see an indication you have done that. If you are not willing to consider that something is wrong in your setup, then you are unable to fix it.