From info I've seen on other forums, this drive seems to require the Ritek G03/TDK 2X standard for reliable DVD-R burning. This drive was designed following the +RW camp first and -RW second, so you may actually get better results with a cheap +R media if you have a PS2 that will read it well. The discs that typically meet this higher quality standard that I've used in my A04 have been the Accu and Lead Data certified 2X, True 2X, and the 2X TDK's and Verbatims. I've tried some OptoDisk 2X's (the Liquid Video Brand sold at Circuit City) and they bombed in the PS2 unless burned at 1X. My "it plays anything" Apex DVD Player (hacked 1100) didn't like the OptoDisk spec much either unless at 1X burns.
Basically, you don't want to go el-cheapo on the -R with these drives.
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.