Princo is utter crap. Most people generally use Princo as a term to describe the worst discs possible. So phrases like "deteriorates like a Princo" are the sort of thing people use. That should tell you all you need to know about how bad Princo is.
Daxon media is of average quality. It's not that good but not that bad.
If I remember correctly, the 4166B has a problem with CMC MAG D01. It will only burn those discs at 4x, even if you select 2.4x and you inevitably end up with a coaster. It's some sort of issue with the firmware and these discs. This may or may not affect you. If it does, I'm sorry but I don't think anything can be done about it.
I'm not sure if the writer has support for these media codes at their rated speeds in the version 1.02 of the 4166B's firmware. If it does but the discs still seem to burn at lower speeds than rated, then there is some other kind of lock on the burn speeds of these discs and no amount of using MCSE will get around it.