Burn Speed Problems with Create Disc on Nero CD-DVD/Disc Speed

I need some help figuring out why Nero CD-DVD/Disc Speed will not Create a Disc with BD-R media in a timely fassion. I have tried different BD-R burners Pioneer BDR-203, Panasonic SW-5584, LG BH08LS20 and a couple different types of media to no avail. I see that others have posted graphs from these drives and they appear good compared to the graphs I am seeing. It just seems that DiscSpeed starts these drives out always at 2x and they never go any higher than 4x. Let me know if I am doing something wrong or any suggestions. Thanks in advance.