Yeah it seems like so far the best output has been as a 756×480 sqare pix output so it matches the dv widescreen frame size and letting the video editing software interpret it and divide into rectangular. I also tried more pixels stretched down to a 720×480 output frame as I have seen recommended for stills (psd etc) but I think it actually converted to 720×480 square pix or something, as it seemed even worse when stretched out than the other methods.
Thanks for the reply. If anyone has ever had any luck doing this please let me know your methods – in the meantime I will continue outputting the fottage to our video team this way.