i have a sony dru-500ax ver 2.0c

up until recently i have only been using name brand medias

then i decided to get ritek g04 thru esbuy.com

dvddecrypter and recordmax dx both recognized that they are 4x media. recordmax even claim that it is burning 4x, but when it was completed i checked the log and it took 30+ minutes to burn, equivalent to 2x. Decrypter also burned at 2x. What am i doing wrong? should i turn off burnproff? Funny thing is that in test burn mode, it does it in 4x, but not in real burning. I believe this has been discussed before but i remember the solution was unstable. Has a definite solution come up?

Is the ritek just junk? should i just stick to brand names, especially if i am getting 2x anyway?