Not sure if I've ever mentioned this before (because to be honest I've not looked over the script in detail) but this line:
Spline16Resize(728,388).Crop(8,14,-6,-10,align=true).AddBorders(3,58,3,58)
rings another "alarm" bell, aside from my argument against resizing to anamorphic.
Any compliant DVD player shouldn't show the 8 pixels (NTSC) or 9 pixels (PAL) at left and right, because that part of the video is reserved as "nominal analogue blanking", so you can avoid the horizontal resizing altogether - or was this written with NAB in mind, and gets rid of more vignetting...
If your DVD player/display isn't compliant, you can always just crop to 704 pixels wide, because this is also DVD-valid.
DE