Here's an update on Wii backups with my stated setup.
I dumped Super Mario Galaxy 2 using RawDump 2 and a GDR8082n DVD drive. Burned game with ImgBurn at 4x on Sony DVD-R disc. Booted up no problem in Wii and played for about a half hour with zero issues. Next game update will be NSMB when I can get my hands on an original disc.