Hello guys!
A little help needed here

My card is an ASUS RX470 STRIX GAMING 8GB OC with micron memory, and I'm doing dual mining ETH+DCR with claymore. And using afterburner for tuning.
I tried a lot of variations but my best was 25MH/s ETH + 780 DCR. (or 26MH/s single)
drivers: 16.9.1, 16.9.2, 17.5.2
gpu: 1000, 1025, 1040, 1050, 1100, 1150, 1200, 1250
mem: 1750+
straps: 1500, 1625, 1750
At the moment I'm mining with 16.9.2, 1100gpu, 1900mem, 1750 straps (this seems stabile and the best so far)
Highest was 28.5MH/s with 17.5.2, 1200gpu, 2100mem, 1750straps, but GPU failed over and over again.
Also tried WattTool, and copied the settings Insider posted, but could not get better result at all, and most times my pc crashed.
My goal would be 28-30MH/s if possible. I would be glad if you guys could help me.
Original rom:
https://www.dropbox.com/s/w51ulftpsbn7wtz/asus_RX470_strinx_8gb_oc_original.rom?dl=01750:
https://www.dropbox.com/s/snvm4a5nbwyaibl/asus_RX470_strinx_8gb_oc_0.1750_mod.rom?dl=0Thanks!