Have two timings for hynix from russian board, maybe you can try this:
Hynix; The most stable in frequency. 1167 / 1980-2070. ETH = 28.5-29.4 MH / s.
777000000000000022C39C00AC595A3D90550F12B84C8408004006007E0514206A8900A00200312
0100F292F94273116
Made on the basis of 1. But slightly weakened timings. This gives + 50-80 MHz. At the same frequency, the loss is 0.2-0.3 Mach. At +50 wins + 0.2-0.3. +80 = 0.5-0.6. Frequencies 2050-2150.
999000000000000022C39C00AC595A3D90550F123CCF530C004006007E0514206A8900A00200312
0100F292F94273116
source:
https://forum.bits.mediagood luck!