Yes, QE/CI for the ATI X1300 under Lion (or lack of it) remains work in progress; sorry I've just not spent much time on this recently. Still on my 'ToDo' list...
Regarding the graphics issue you're experiencing with SL, there's a good chance it is due to the default boot setup arrangements. Basically, ATI X1300 is supported at Chameleon level if you use Azimutz's branch boot file + ATI module and it does not look like they're included in the bootpack. As such, there may be a problem with the graphics kexts present in the bootpack, especially the enabler. Without the Azimutz's Cham files (i.e. without low-level legacy ATI support), you will indeed need to boot with option "GraphicsEnabler=No".
I can suggest 2 things:
1) take out the EVOenabler kext from the USB installer /E/E folder or your SL partition /E/E folder and re-run myFix (full) on it
2) use the Generic Extra on your myHack installer, it'll still allow to boot and install SL on the system with basic graphics support. You can subsequently tune and finalise through EDP.
I'll try and do a brand new SL installation on a spare HDD later on...
Thanks for your feedback, it'll help adjust whatever may be necessary.