If it is interference then it will be worth trying to relocate the ballasts away from the PDC.
I have a set of angel eyes awaiting installation and noticed that the ballasts are plastic and the cables aren't shielded. If you look at the Xenon ballasts on the other hand they are metal and the cable is shielded (although probably kick out a much higher voltage).
When I eventually get hold of an ECE drivers side (passenger side UK) Xenon Headlamp unit I'm going to try extending and shielding the cables between the ballasts & angel eyes if I have a problem with PDC.