Mostly depends on ur hardware...I mean, I have a Plex 1210A too and I have the same problem...the only SD2 protected game I've been able to copy was GP3 2000 Addon, and using DiscJuggler (last version). To perfectly copy SD2 protected games you should consider the fact to change your burner to a Yamaha 2200 or another device that can bypass SD2 protection...(maybe the new Plex 2410?)
Hope this help

Robaerus