Audio advanced by 3 frames when rendered

Hi,
Thanx in advance for your help.
I'm using CS5 Production Suite.
Cameras are:
Sony FX1000
Sony AX2000
Sony V1U
Sony SR11
Canon 7D
Sequences are created using an XDCAM HD 1080 30p preset.
I'm shooting live music videos & all videos are shot in 30P (most tracks at 1920 x 1080 with the FX1000 at 1440 x 1080, all at 48 Khz stereo).
The H.264 preset has been slightly modified to render at 1280 x 720 30P, audio is shot and renedered at 48 Khz stereo.
In the editing window things are synched perfectly. When I export to an MP4 file using the H.264 preset the audio gets rendered out of synch advanced by 3 frames. If I go into the editing window and delay the audio by 3 frames it renders the output file in perfect synch. This is true for on-camera audio tracks, multi-camera edited audio tracks and for tracks with imported audio wave files produced in Cubase by the sound engineer.
Can someone help me understand why this renders out of synch?
Thanx,
Mel

Thank you Harm for your help. When I use the new
item icon to create a new sequence the XDCAM presets match the parameters of
what my cameras shoot more closely than any others. I did take the base
preset for the XDCAM 1080 30p and modify it a bit to better match my cameras. But the only mismatch I have is that the FX shoots 1440x1080 1.333 pixels and the others shoot 1920x1080 1.0 pixels. But that's a video issue and I assumed it didn't affect the audio output. I've tried other settings, like the ones worked under CS4, but they produced jerky video and audio in CS5.
May I ask which preset you would suggest based on the cameras and parameters of the footage?
Thanx,
mel

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