Sync drift problem on FCP

So i log and transfer my footage using FPC version 7.0.3 and Im using a sony hdr-cx155/ AVCHD
The problem is the audio when (AIF) files editted in logic are put in sync initially they then are way out by the minute mark.
I think its the frame rate - and changing the set up from DV-NTSC to DVCPro HD-720p25 has helped a bit but not totally....admittedly this setting was a guess - i have no idea what works best with these cameras.
can anyone suggest the correct answer?
also having already used log and transfer to capture the video with the initial set up - does that matter...i have now deleted the footage from the cameras?
Look forward to the help
Hazel

Why were your original settings DV-NTSC if you are in the UK?
Why have you changed to DVCProHD-720p25, the camera doesn't shoot that format?
Have you erased the footage from the camera and not kept a back up copy on your computer scratch drive?
What were the original video footage settings in the camera(s)?
More details about the audio settings exported from Logic.
More info like this will possibly help establish your problem.

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