Are you exporting to DV AVI? The same quality that is on the MiniDV tape? Or did you pick some other, lesser quality, codec when you exported?
There may be things about your video that look better in MPEG than in DV AVI. Some text really shows the difference in codecs. I usually export to MPEG2-DVD and not to AVI. It saves one generation of transcoding.
Steven
https://www.stevengotz.com