If you go groestl use sgminer, get the updated kernel. I dropped memory clocks on the cards as low as they would go, upped GPU clocks as high as they would go on stock voltage. I've not messed with skein.
so i got it running at around 21 Mh/s so i believe thats not too bad temp at 56c and I at 19
so is this good or think it should be running better?
I suspect it's not too bad, given how old the GPU in the R9 39x cards are (same GPU as the R9 29x cards after all).
For perspective, I think I was pulling 45-50 Mh/s ballpark on my "testing" GTX 1070 rig per card though.
I strongly suspect that the R9 290(x)/390(x) are best off mining ETH or it's spinoffs at this time.
so i changed my driver to the 15.12 verson was running the 17 and it doubled in speeded so thats a big help there