NEC ND-3550a moded media issues

Ok, have updated my NEC ND-3550a to ND-4550a, and no problems there. However, when I attempt to burn my dvd+r (CMC Mag M01 000), Nero says that it is burning at 16x but according to the time, it is more like 8x. My Lite-on and HP 640c drives all burn this media at 16x with no problems (6:15 secs avg). My NEC (before and after firmware mods) still burns at 10:30sec avg. Any ideas?

Discussing that matter is not appropriate outside the one thread exactly made for that!! :cop: