-I 19 -w 128 --gpu-engine 1100 --gpu-memclock 1250 --gpu-powertune 20
gpu-engine 1100 is too high. down it to 1020 (max stability on my sapphire r9 290) but set -I 22 (and maybe higher) for this coin.
i can set -I 26 (>3Mh per card) but my CPU is too slow for