Pimp sgminer groestl config file for R9-280x

[usao]

Ive been trying for several days to get PiMP sgminer to work with an R9-280x card using Groestl algo,, but not having any luck.
The config either fails, or if it does run, I get 100% reject rate, no matter what I tweak in the config file.
Im looking for a suitable config file for Groestl which works with an R9-280x card.

[Karwoo]

Yep, same problem here, 100% rejects!!

[usao]

Myr-Groestl or Groestlcoin?

Groestlcoin, although since the price has dropped 50% in the past few weeks, im not so sure I want to run my GPU's on this anymore...

[Karwoo]

i am using the latest version of pimp, same problem, i want to mine DMD with R9 290 cards.
myriad groestl is no problem (28mhz).
is there a fix for this?