Hi gdp77, welcome to our forum
It can sometimes happen that a CD-RW drive is limited in write speed when recording in DAO-RAW mode. The same thing happens with the Plextor PX-W4012TA drive (which was limited to 24x in DAO-RAW recording). I can't say for sure that your MSI drive has the same issues but it could very well be, especially since the drive does record at 52x when using Nero.
Also, are you sure that Nero is actually recording at 52x? What's the write time when recording at this speed? Nero normally just reports the write speed that you selected rather than the actual wite speed. CloneCD report the actual write speed. Nero can also report the actual write speed when you use this registry hack.
Please report back!