notebook DVD drives are almost always in a sled(4 screws) and only held into the laptop by 1 or 2 screws(not ideal).
I have noticed that some blank and even pressed(retail) CD/DVD's(cheap) do not have good balance and even have bumpy edges(I have 2 slot load notebook drives so can see what you are putting up with). Desktop drives are far less prone to this as they seem to have more room for a nice weighted magnet onto of the disc.
The short term solution is to try to burn slower. You may find a speed that it is not as bad at.
Nope, I would try other discs to see if it is all or just some If some, do not buy those any more. I once picked up some very cheap DVD's(just needed some DVD's in a hurry) at wal-mart and damn they even had bad vibration in a desktop drive.
Most laptop DVD drives just have 1 or 2 screws on the bottom to remove then, so it may be worth a look.
On that topic. the SilverStone FT03 case only uses 2 screws on its slim slot load drive. Seems ok with most discs.
I am honestly going to still go with slow that sucker down.