IPhone 3GS headset jack out of spec?

I have been experiencing problems (similar to some of the other posts) when I try to use Apple's standard headset and three other third party headsets with my 3GS.
When I plug the headset in, people can hear me, but I can only hear them faintly. If I pull slightly up on the jack, I become garbled to other people, but I can hear them clearly.
The same headsets that I have tested work on 3G iPhones.
It's my belief that the headset jack in the 3GS is out of spec.
I have gone in to the Apple Store and have received two replacement 3GS phones to verify that it was not something unique to my first phone. I am now convinced that there is a definite hardware issue that needs to be addressed.
Any help that anyone could provide would be appreciated.

Thanks for your suggestion. It's definitely not a volume issue.
I've been using the original iPhone exclusively with wired headsets since the very first phone was released. I finally upgraded to the 3GS when it was announced, skipping the 3G rev. As such, I'm super familiar with the functions of the phone.
It seems to definitely be an issue with the jack itself, as I have now tested it independently on 3 phones, with 3 Apple headsets (the one that shipped originally with my phone and the new Apple/Bose headset, and with a headset that shipped with a 3G phone). As well, I've tested with two third party headsets - one made for the 3G and 3GS and one that works on my old iPhone via a TTY adapter.
I'm really hoping that I can get some feedback from Apple directly as I don't know of any simple resolves for a hardware issue that has shown up on 3 phones and repeated on two unique trips to the Genius Bar.
Btw, while I was in the Apple store recently at the Genius Bar, the person behind me showed up with the same problem.

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