on my 811 i get spikes when i burn at 8x on ricoh r01. when i burn @ 4x they are "acceptable"
when i kprobe the same disc on my 811s hs0p and my 411 fs0f the 411 shows half to 2/3rds less errors. not sure why.
i have also found differences between spindles and even discs on the same spindle. i just got 200 ritek r02s for $80 to try and see if they burn any better.
on the images you may want to repost them as pngs and edit your post above. they are almost a meg in size, which for dialup folks is 3-4 minutes for each image to load.
the png's format will be 15-20 k in size and load very quickly.
when saving in kprobe it defaults to bmp for some strange reason but you can change the format in the drop down box below the filename.