Well we have discussing about burning alot here at GBATemp, and the best thing that works for you, never works for the other, but I kind of remember someone saying that with a ModChip there isn't any issue about burning, that is only for softmoding and the gamma launcher, you'll be fine burning with ImgBurn at 8X, for me what has been working good (not that this make any difference) is:
SONY accucore
DVD+R
burned at 16X with Nero6
with book type changed to DVD-ROM (this last thing doesn't matter for ModChip users)
and if they where scrubbed, that means they are fake signed and they wont work on 3.4 or 3.3, and you'll need to downgrade your Wii to 3.2, but wait for your modchip and then test them, you might be wrong about that...!!!
SONY accucore
DVD+R
burned at 16X with Nero6
with book type changed to DVD-ROM (this last thing doesn't matter for ModChip users)
and if they where scrubbed, that means they are fake signed and they wont work on 3.4 or 3.3, and you'll need to downgrade your Wii to 3.2, but wait for your modchip and then test them, you might be wrong about that...!!!