I'm on a Mac right now with my own USB interface. I'm going to get access to a PC this weekend and use ADIsimPLL since I'm also have lock problems when the output isn't an integer multiple of the reference. I'll post those results asap.
The register settings are:
0x0080 0005
0x0025 A23C
0x0000 000B
0x7800 4EC2
0x0832 0051
0x3200 0000
Tom