Best Firmware for 3520a and RITEKG05 Media?

I’ve got a large amount of RITEKG05 (Brand: conmark 8xSpeed) DVD-Rs.
In the L&D Firmware 1.UE I’ve found some people having problems with this type of media. Perhaps an older firmware-version (eg 1.u8) shows better results?
Can somebody recommand an “best” version or should I always use the newest?