I think it best to end my part of this discussion since I believe we are beginning to go around in circles. I do not "buy into" the idea that some makes of saxophones play best when the key heights are significantly lower. I'm talking about more than a millimeter or two lower than the average. My understanding of acoustics and my years of experience as a repair tech, teacher and player has lead me to the conclusion that all saxophones play their best when all of the notes are "well vented" period. If there are those who have different opinions, that's fine if that works for them.