First, you need to know for sure whether your camcorder/tapes are NTSC or PAL. The manual for your camcorder should tell you. Generally, if you purchased the camcorder in North America, it is an NTSC camcorder unless you went to unusual lengths to specifically get a PAL camcorder. PAL is used in Europe and certain other countries, but not in North America.
If you are sure your video was recorded with 16-bit audio, then you should select the DV-NTSC easy setup in FCE and create a new sequence. Then capture your video. If you have already captured your clips, select the DV-NTSC easy setup, create a new sequence and place your clips in the new sequence. Should fix the out-of-sync-audio problem.
The DV-NTSC 32KHz easy setup is for 12-bit audio only. If you put 16-bit audio into a sequence created with the DV-NTSC 32KHz easy setup, your audio will be out of sync.
Remember ... 16 bit audio = 48KHz (default in FCE) ... whereas 12-bit audio = 32KHz