you have to note that many games only assumed a Drive A, so when they start they always access only drive A to get the rest of the game loaded. What this means is that the loader of the games can be from any drive but the subsequent parts may be hard wired machine code to load only from drive A (and this is most often seen to access strange sector formats which are difficult to copy from A to B).
Vyper68, Did you modify the drive so that the CPC can see it? And lets not forget the READY line too, it may need patching. Also do you have an old PC which you can test the floppy in to see if it works before any mods are/were done?
rpalmer