Well, for starters......read the rules.....
What you've got going on is not condoned or supported here...in short, it's illegal no matter how you try to justify it. It's one thing to backup a copy you have on-hand--it's a whole different story when you download the files and burn them.
Second, you appear to have the files as they would be copied off the original, not an image. You will need to use the CDDVDGenerator to markup an image with the right pregap and LBA assignments. Once this is done, an ISO image can be created and burned directly.
There are tutorials available on how to do this. Check with the site where you got those files from for links. They should not be offered here. This thread may get closed by a mod.
If it ain't broke don't try to fix it! But, hell if you can tweak that bastard just a little bit more....hehehe.