Update: Just for the hell of it I reflashed my "junk" Lite-On 411S to a 811S using the Zebra Mod from Speedlabs.
With the latest (and patched) 811S firmware I was able to burn a Verbatim 4X at 8X and a Memorex 4X DVD-R with no problems. Both played perfectly in my cheap Mintek DVD player. Memorex's always gave this drive problems before.
Looks like I wont be using this drive as a doorstop after all.