How are you importing? Or are you capturing? 2 different things. xmp files are metadata files and you can turn them off in the preferences: media. Don't think I've done any capturing from hdv in premiere (luckily haven't had to work with this format for a long time - it's not a fun format) , but had to do some work on a legacy project a few months ago with minidv tapes and premiere captured as quicktime files with uncompressed audio embedded in the quicktime (Hopefully I'm remembering correctly - I can check if it's important).