Burning grossly oversized images...?

[vsp]

I'm fairly new to the DC burning process, but I am making significant headway; I have DJ 4.x (registered), and have gotten a number of images to burn correctly using both it and Nero 5.5.

A couple of DC images I've tried have been over 700MB (one at 737,946 KB, one at 723,673KB), and they burned and booted fine.

However, I have been generating coasters trying to burn a pair of DDR CDI images -- one is 780,706 KB, the other 783,490KB. DiscJuggler (using default settings, and one attempt at checking Overburn) keeps asking for a second writable disc, indicating that it's out of write-space; Nero (after CDI2NERO) seemed to burn okay, but also produced a coaster. The discs go to the Audio screen on the DC, and won't boot even with a boot disc.

I located a NON-self-boot image of one of these DDR games (which came out to 588,853KB)... and it burned and plays okay.

I'm using an LG CED-8102B under Win98 SE, trying Kodak and Sony 80M/700MB CDRs.

So, my questions:

1) Is there a way to convert a self-booting CDI image to a smaller, NON-self-booting image? (I have no problems using Utopia, and would rather have a disc that works with an extra step involved than a self-booting coaster.)

2) Is there something simple I may be missing in DiscJuggler's settings, that would make these images burn correctly?

(There is the distinct possibility that my images are just hosed, but they did pass the unRAR and SmartPAR tests.)

3) Is there a different approach I should be taking?

Thanks in advance. I'm new, but I'm not hopeless.