I don't trust the compatability line. In the beginning, Phillips/Sony started out saying that about DVD +RW, and it wasn't very accurate. Dual Layer already reads poorly on a pressed DVD, just imagine what it will be like on a recordable format. The typical 8X/4X drop on the switch with pressed DVD would proportionally drop it to about 3.2/1.5 on a recordable in my same reader. Just imagine in a PS2 that reads pressed dual layers on about a 3.5/1.6. Not too good! Might need to get a set-top DVD Player if you're using your PS2 for movie playback.
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.