A 16x DVD burner diode needs some heatsinking. The lens does not help here. The aixiz housing provides some heatsinking, but more will be needed. Some creativity with washers, etc. helps here. If you somehow have access to a machine shop (school, work, somehow) you can make a custom heatsink to fit your host.
As far as driver current, maybe do a search on 16x dvd diode, read the postings over, and decide what setting you want to use depending on whether you want long life or maximum burning.