Few things to try:
1. For your model, look in org.chameleon.boot.plist in the bootpack. These are some of the flags you can set to get the iboot (chameleon, stolen and rebranded)/retail DVD to work.
2. When you used the SLD430 image, did you use the right bootpack for your model?
3. After you boot into OSX with -x, install EDP, then run the edptool.command from the Extra folder, choose option 1, and then the D630 model you have, also go through the options 2,3,4.