I have tried three different pools, changing the default settings to the pools specified settings (--groestlcoin instead of -k) I've gone through .bats trying to find out if I could change anything out, and get it to work that way. The --difficulty-multiplier 0.0039062500 say unrecognized option.I've tried your pool, and still no luck.
I'm really not sure about the "groestl kernel" I have a kernel folder in sph-sgminer-groestlcoin folder if that makes any difference at all.
It's simple. If your sgminer says unrecognized option, the it is not the latest version.
You can get compiled versions from here:
https://bitcointalk.org/index.php?topic=475795.0It has some command lines too