Should I read at lower speeds?

[Machina]

I have Lite-On 52x/24x/52x CD-RW with latest firmware.
So far I tried to burn (backup) only one game with it - BF1942 and I used Alcohol 120%. I read that Bypass EFM error has to be unchecked (or use SafeDisk 1 settings, but the game is SafeDisk 2 protected).

Well, I read at speed of 52x and burnt at 52x
I could NOT makr a perfect backup, I tried 3 times, and it does not detect the CD as the original.

Should I read or burn at lower speeds?
Any other ideas why I can't make 1:1 copies?

Note: I got latest drivers for my IDE controller, etc.