You're doing everything right in the burning department, Morbat. I use DVD Decrypter, and usually burn at speeds between 4x and 8x with no problems at all.
As Milady said, your PS2 won't boot those perfectly-burned backups until it's modded in some way; either a mod-chip, or a soft-mod like Free MemCard Boot (FMCB). I'd advise getting yourself a Swap Magic disc set... it allows you to boot backups via swapping, and also allow booting of homebrew .elf files from a USB drive (this also allows you to install FMCB, if you wish). Go here to find out where to get 'em:
Download Links:
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