A little help?

[Psyduck]

I'm pretty new to all this, so it could be a simple answer...

I've got a few DC backups, about half of which work, and half won't. I'm using a European DC and Discjuggler 6. Some games - Ikagura, Border Down, Powerstone 2, Street Fighter III - work just fine. Other, I'm having problems with - Zero Gunner 2, Psyvariar 2, Rez.
The images work fine in chankast if I mount them using Daemon tools. If I burn them to a CD, however, they show up as an audio CD in chankast and in my real DC. I've tried using the utopia disk, but although it gets to the raindeer screen, it doesn't seem to load anything after that (even the backups that normally work).
The CDs that I burn do seem to have burned fine however, if I look at them on my PC, they look identical to the image when mounted - as far as I can tell, anyway.
I still have a couple of ideas left that I could try DJ2, the PAL patch program stickied in this forum, other boot disks...but I'd rather not waste many more CDs if possible, I've already burned extra copies of these games. If anyone can give me any help with this I'd really appreciate it.

Thanks in advance!