This http://redump.org/disc/8047/ is the only exception, the other one is the same of my examples, that is not garbage unless it has wrong offset.
Wrong, you can't dump WWF by reading the descrambled sectors and rescrambling them - this won't give you the proper image.
About the other point you don't fix anything, simply speed up the process importing the same sectors from an empty image without redumping it with cdtoimg or trap disc. There's nothing to fix or modify, disc has always the same structure, if it's mode1 for example, all empty sectors will have the same header at same position for any disc with mode1 form unless toc is fake.
Please, don't ever generate any data, every byte should be read from CD, over. Your method is only good for converting the random dumps to match our dats, but if you're gonna add such semi-generated dumps into db - I'll kill you. You can't say the sector on the particular CD is good and doesn't have any mastering errors without reading it - you can only assume that and assuming is always bad, especially when you claim that the dump comes from the actual CD.