theres not much u can do quite frankly...
burning successfully is a matter of Media/firmware/Burner combination,,,
at least then,
1-install the latest Firmware for your burner --> Here!
2-then buy and use a DVD Lens Cleaner on your Burner --> Here!
3-Try burning your current media at ALL of the write speeds your drive says it supports for that MID
(look in the disc info text on the right of the main screen to see what they are)
if all of this doesnt work,,,
buy VERBATIM