Set the CPU priority to "high" for the CDSpeed process in your Task Manager. That will make the read graph smoother if the disc is written well.
The fast-forware error might have been caused by some software problems, but that's just a guess. If the disc data is read well, fast-forwarding shouldn't be a problem. When I watch a DVD-Video title of movie or animation or TV drama, I use the fast-forward fuction a lot. If it stops many times or display big distorted images, it's usually the disk problem. But your disk seems to be fine.