No need to rebuild, you had already done so 20 times. Just need to update the EFI/Clover folder with the file and folder I attached. Keep the kexts you have been using since I didn't attach any. The SSDT and Config file was configured specific to that CPU, so no need to regenerate new SSDT.
You can add RAM or remove RAM as any time, it does not affect the DSDT, only if you change BIOS version or BIOS settings. I noticed your signature said A13, but in the screenshot it shows A12. Stick with A13 as this version, the Optimus option won't revert itself after reboot/restart as it does other version.
The max RAM this system can hold is 16GB, means, 2 8GB per slot or maybe 1 16GB stick. See here