Fat PS2s have "picky" lasers. They'll only work with good, high quality media. However not even all of them will work.
As I was picking up the verbatim DVDs, I figured I would get some CD-R as well. Well guess what... No PSX game burned on these disks work.
I think that people have stated that Verbatim manufactures good DVD-R discs (Those with Super AZO, manufactured by Taiyo), but their CD-R discs didn't work with FAT PS2s (Need some confirmation on this, since this is based on my past research).
Your drive might not support lower speeds.
P.S. Alcohol 120% only lets me burn as slow as 16x, how do you get it lower?
You're right: Burn speed might not be the problem.
P.S.S. I burned other games at max speed and they are flawless so I don't know if burn speed is the problem on the Verbatim disks.
Fact: The "set to a lower burn speed" trick is usually meant for older burners, and burners that can't burn discs reliably at higher speeds.
Just try some another brands, but avoid some brands like Imation (C&C Magnetics Corp.).
I personally use Verbatim DataLife Plus DVD-Rs with Super AZO (Taiyo), and Sony CD-Rs for PSX games.
It's a little late, but: Welcome to PSX-scene!
First off, give a forum noob some love, or a hug at least. Hello!
Unmodified SCPH-77006 with SM 3.6
SCPH-39006 with M-chip modchip, SCPH-10281 NA and refurb Seagate 80GB HDD
SCPH-10000 v1.00 with SCPH-10190 PCMCIA NA and SCPH-20400 HDD unit