If the OC snapshot doesn't fix it then you'll need to go through each section of your .plist and check to make sure all the quirks are set correctly. Check the other sections too. You can run your .plist through the sanity checker to see what may be not set correct. Go to the Haswell part of the Dortania guide to see the Quirks settings. Also recheck your BIOS settings as per the guide.
Sanity check your OpenCore config.plist
opencore.slowgeek.com
Of course you must choose Haswell in the CPU section before running this.
View attachment 499446