Finally it's working beautfully! THANKS A LOT GUYS!!!
Ok so I kept it on MacBookPro8,2 since in the end it's a 15". When that was done I copied dsdt.aml to dsdt1080.aml. Then ran through the installer again straight away (without reboot) to select the non-1080 options.
It runs with the Chimera boot loader right now. Resolution seems to be great. Very smooth. But where should I see a second option during boot to try out the dsdt1080.aml?