Excuse me but I don't understand.
I think I haven't bad burns with them.
I usually burn at 8x and 12x speed -no need high speeds-, using good quality +R media (Verbatim DVD's)
DVDInfo says Quality: 99,25% - 99,60%, and Average Jitter 8% - 10%, similar to Lightning UK! review.
CDFreak' review of my Lite-on iHAS-422 (25,50