Lower CD-R write speed ?

Hello I was curious to know. I heard there could be firmware preinstalled that forbids low write speeds. I'm trying to achieve 4x I burn with DiscJuggler. It reports 30x-40x speeds, despite setting 4x everywhere in it. I'm using Sony blanks.. or could they be the conflict ? My friend said to try Nero DiscSpeed.. to hopefully lower the drive's minimum write speed.. I set 4x here and...