Are you talking "Full Disc", 'Main Movie', or one of the 'Customize' options??
I am also assuming from your post that you are applying compression to the files to fit a DVD5 SL disc...
Can I also assume that you have exempted any non-video items (Games, web site links, etc,) from the rip??
Does the final size you get exceed 4472 Mb?? And as far as that goes, what is the DVD5 size in 'Common Settings', which is what is currently bring used for rips...?