Your main problem is choice of media. For dual layer blank dvds, you should buy Verbatim +R DL. Also, look on the cakebox and make sure the Verbatims you buy are made in Singapore rather than India.

I don't know offhand who made that burner. May have to go poke around in the burner subforum.

Edit: Looks like it is probably manufactured by Lite-On, so it should be decent.