HD 4600 is Haswell, according model is MacBookPro 11.1. If you change your sys-def, Secure Boot Mode has to be none, not default.
Try to boot without DSDT, disable it in your config, let OC squeeze the BIOS DSDT :)
Maciasl can't open your SSDT-EC.aml, it's f****d-up, use another one.