Has anyone had any good results overclocking the ASUS RX470 Mining Edition cards?

Hynix memory.

I have tried everything.
Basic strap swap
Various online strap mods, including UberMix 3.1

The best I can get is 27.7 MH/s. 1970 mem, 1167 gpu, no errors.

On MSI RX 470 (Samsung) I can get 29 and 30 MH/s with min to no memory errors in HWiNFO64.