Hmm...
Using Clover Configurator app:
SMBIOS: change from (empty) iMac14,2 to MacBookPro11,1 (that should fix your graphics issues)
Rt Variables: change BooterConfig from 0x0038 to 0x28 and CsrActiveConfig from 0x03ff to 0x67
Follow guides published on this site and read E7440-related threads in order to avoid such mishap.