I would suggest 12x or 16x (CLV) on Verbatim DataLifePlus media.
Sticking with the CLV writing method is probably a good idea, which means (depending on your writer) not burning faster then 20x. Jitter can also be a problem, so to keep jitter scores low you want to burn at a slower speed (i.e. <32x). You also want to keep the C1/C2 error rate as low as possible, which means using good media (i.e. Verbatim DataLifePlus), as well as an appropriate burning speed. I've found that with good media, burning too slowly can sometimes actually *increase* the C1/C2 error rate, so I that's why I suggest 12x or 16x, since these speeds always seem to perform well for me on my testing.
Good luck! and I hope my answer helps