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Have you checked the mouthpiece pitch you are playing with your regular embouchure setting? It should be around G concert on tenor. What you are describing is a common symptom of playing too high on the pitch of the mouthpiece, tuning by pulling the mouthpiece farther off the cork, and causing the upper octave to be flat in relation to the lower octave.

You can also try this test from Larry Teal's The Art of Saxophone Playing. Play your low A and just flick the octave key. If it goes to high A and stays there the embouchure is too tight. If it goes up momentarily but the upper A is flat and flabby sounding, the embouchure is too loose. If it produces a clear and in tune A for a few seconds and then drops back down, the embouchure is set correctly.

You might also try playing the low octave note and overblowing to the note an octave higher without the use of the octave key. Another way to do this is to start the upper note with the octave key pressed and then release it. These tests will show what effect, if any, the neck octave vent has on the pitch and/or tone of the upper note.
 

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Perhaps I should ask the folks up at Tenor Madness or someone with experience voicing and setting up saxophones. Anyone that's ever taken an acoustics class should know that an interval less than octave between the first and second partial is likely the result of a venting issue. I was just wondering if anyone else had any experience rectifying this issue in a similar manner.
Anyone who has studied woodwind acoustics knows that this is not entirely true.
 
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