I will through this in.
Make sure your keep your frame size to 720 480 as you do not want to perform any scaling to the orginal DV material as you may introduce interlacing problems.
ALso remember that you are changing from a 4:1:1 color space to a 4:4:4 color space and ultimately back to a 4:1:1 or 4:2:2 color space (depending on which codec you end up outptting with in FCP, but it won’t be 4:4:4 unles you have a raid that can handle the speed required and a deck that can accept 4:4:4 (Sony SR).
So before you run your film through all of that transcoding you might consider bumping it to a nice 4:2:2 codec (like DVCPRO50) and color grade it in FCP.
Just a couple of thoughts, that might save you a lot of useless effort and help you avoid potential problems.
David
Peace and Love 🙂