Ok, I'll try your settings.
But.. if I directly export from FCP to Compressor, without creating any QT clip.. do you think it'd be better?
I told tou about the progressive source, because I read an article on Adobe Web Site about FLV compression, where the authors wrote to start from a progressive source to encode in FLV video format.
Here the link:
http://www.adobe.com/designcenter/dialogbox/encode_video_02.html
Regards,
Alessio