I don't have any RX 560, but I've mod some of them and they have better hashrate but that was only Micron. Soon I will have improved Hynix timing, it need more testing, it could work on RX 560 too. I think 14-15MH/s can do Hynix timing what I have even now.
I can test it with yours timings
Default Hynix BIOS:
https://mega.nz/#!ViwzXCyI
Hi guys i ve hynix memory and i reach 12.9Mhs with techpowerup modded bios... IF your bios is good can u share it? Ty