Welcome:). My favorite media at this time is the FujiFilm 8x +R stuff that is 'Made In Japan' printed by the UPC symbol. It comes in 25-, 50-, or 100-piece cakeboxes and is often on sale at Best Buy(in the USA) for ~$0.40/disc. They should have the 'YUDEN000T02' MID.
I am assuming you are following good burning procedures, like defragged HDD, no computer activity during a rip or burn, etc.
You may also want to Kprobe your data file burns... bad burns caused by poor media are rarely limited to video burns only...