Hi,
The different CAMs don't all work in the same way. I used to use MGCamd but I read that EVOCamd offers a few more channels on 13E, I think namely AB Moteurs. If you have a Freeview card, then you also need Newcamd to unlock channel 4,5, and
Sky3.
Different key files also vary in what they can do for you. Satan is good, but Satfreaks gives one or two more channels (VH1 on 19.2E), and generally they update more quickly also.
Not sure about the C+ one! I find the same.
I guess you're using a motor with your DM500. I use the same receiver myself along with a Moteck 2100A and find that it fairly often "forgets" to move the dish. Do you have the same problem?
I'm using the satellites: 28.2E, 19.2E, 13E and 30W. Am I missing any other gems?
Cheers.