I would suggest you try using DVD Rebuilder Freeware version with the HC Encoder (also freeware). This will be able to encode your DVD9 movies to fit onto standard recordable DVD with minimal loss of quality. It will definitely be better than using a transcoder like DVDshrink at least, especially for very long movies like LOTR.
This will mean the converted movie will still have 100% compatability with all DVD standalone players. Other conversion options can result in a perceptually lossless video but are much less compatible.