Logic Pro 7 & earlier Sync delay outputting video via Firewire


Hi, using Logic 7 still (not much longer I hope) but I'm sure others with later versions of the program may have encountered this...when outputting DV video via Firewire (using a Canopus dv converter) the video is lagging behind by around 10-11 frames when the song is played. I have tried changing the Video - song adjustments but this does not seem to make any difference at all .Contigious sync is also off.
Any help welcomed.