I have same 1xFan cards with Hynix memory... But only 11.5 Mhs on ETH & 500 on CryptoNight using same modded bios.
Did it! 13.8 MHs from each cards using Claymore on Hive OS!
Core Clock (Mhz): 1200
Core State (Index): 3
Core Voltage (mV): 875
Memory Clock (Mhz): 1994 1932 1936 1936 1926