Tiny movies

I am relatively new to FCX - but have had good success with my first project - my wedding video. That was shot in standard DV, and edited in FCX (not HD), and burned with idvd. I was pleased with the results - full screen video. Now I have upgraded to an HDV camera (sony HDR-HC5), and FCX HD. Shot some footage (regular DV - not HD) - which looked great played back from camera to my HDTV. When I brought it into FCXHD(3.5.1) and then burned the DVD with IDVD (6.0.3) - when played on the HDTV the menus were full screen, but the actual movie was very small - centered on the screen, surrounded by black. Not at all what I wanted - and a considerable step backward from my previous experience. What did I do wrong? - How can I get full screen video back?
any help greatly appreciated

I shot the video in DV (since I can't record a HD dvd), in wide format. Exported it as a self contained quicktime movie. Then brought it into IDVD as a 16:9 formated project and used one of the new IDVD6 themes.
I have done a bunch of reading, and some experimenting this morning. I think the problem may be that I captured it in the wong format (not amorphic). I captured a short clip using the amorphic format and then exported to IDVD, and it seems MUCH better. Just wish that i didn't have to redo the whole project! Is ther any way around that?

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