Update your drive's firmware - http://liggydee.cdfreaks.com/download/en/2510a/219bt_fast.zip
I wouldn't put much faith in the site you mention for judging media quality, there are too many inaccuracies and there are too many variables in media to go by such a list. For example, Ritek F1 is fair media, while their 8x -R media, Ritek G05, is notoriously unstable media and some of the worst media that you can buy.
Regarding burn speeds, under most combinations of burners/firmware/media, you'll get best results at or near the media's rated burn speed. For example, 8x media tends to burn best at 4x to 8x, 16x usually at 8x to 12x. Burning higher speed 8x & 16x media at slow speeds such as 2x will usually yield quite poor results actually, so this should not be done in most cases (there are some exceptions but this is usually the case). Once you've updated the drive's firmware, 6x and 8x will probably give you the best results.
For good, generally very reliable media, Verbatim is about as safe a choice as any - it's easily found, often on sale, burn quality is usually very good, and it's stable media.