UPDATE: Slight progress!
After making 13 more coasters, i finally decided to try and burn dchakker and see if that worked. It did! However, when i try and play any of the .bin games it reboots the CD!
Still, it's progress.....................
So, i decided to extract dchakker and extract Dreamshell 4.0 Beta 4 DC SD Loader, then place 1DC_CORE.BIN in the folder in dchakker, then run it all through Selfboot, making a new bootable .cdi which included the SD version of Dreamshell. And, i think it worked!
I "opened" 1DC_CORE.BIN and got a screen saying "Can't init SD filesystem". I assume that it tried to load Dreamshell, but my circuitry must be wrong somewhere?
Well, at least i've "kind of" sorted one problem, but have now created another!
If anyone knows why i cannot boot straight from SWATs original Dreamshell 4.0 Beta 4 (From SD Loader) file, it'll be greatly appreciated!