i had a similar issue with an intel SSD i had to install chameleon with my hack a few times for chameleon to take in a row. i think my boot sector is a 4k sector drive. it's a known chameleon issue. has nothing to do with the install methods. as for the installer and snow leopard the fault is a bug in my hack. cloning (Restoring in Disk Utility) the apple retail installer to the usbpen first then installing my hack to the installer and your desired Extra folder should work fine.