What DVD burner(s) do you have? Sometimes the "best" disc depends on your burner.
Personally I would no longer recommend TDK, but rather Taiyo Yuden, Verbatim and perhaps Sony.
Did you buy some form of discount Taiyo Yuden (e.g. valueline)?
Did you buy discs that were not advertised as Taiyo Yuden, but which are reported as Taiyo Yuden media codes when you check the discs with your software?
The reason I'm asking is to determine if you have fake or low quality Taiyo Yudens.
Did you burn your discs at a high speed (higher than 12x)?
Sometimes you'll get inferior results at the highest burning speeds.
8x is usually a safe burning speed with 8x/16x rated DVD media on modern desktop DVD burners.