Are you running the new beta drivers for them?
Hauppauge HVR-2200 - What a fantastic PCIe Dual Digital TV Tuner
Also, I think you're over complicating things with the export/import registry set up.
Do this:
Simply install both cards with the above drivers.
Run the VMC set up & select the 2 tuner option & scan, etc.
Close VMC & use the
Tuner Edit App to enable & name the extra tuners.
You might still need to go in to the tuners section to manipulate the watch record order properly (make them 0/3, 1/2,2/1,3/0 & make sure you include the Watch Preferred & Record Preferred entries for the appropriate tuner (0xffffffff or what ever it is).
Reboot.
Justin