Hmm wondering what im doing wrong, i get 200hash (not kilo!) with these settings in yacminer.
my startup line:
yacminer --scrypt-chacha -o stratum+tcp://mrceu.nut2pools.com:6000 -u x -p x -w 128 -v 1 --gpu-threads 1 --lookup-gap 3 --buffer-size 2570 --shaders 0 --gpu-engine 1080 --gpu-memclock 1500
Im not familiar with yacminer AT ALL
EDIT:
Able to get 6Khash with this:
yacminer --scrypt-chacha --nfmin 4 --nfmax 30 --starttime 1389028879 --worksize 128 -g 1 --lookup-gap 3 --buffer-size 2590 -R 7680
Take out the shaders setting all together. Take out the vectors setting too. Try -X 32 or -R 8192 intensity. There is a README.txt you should find helpful in the yacminer folder. I bet you can make buffersize 2688 as well. Let me know what you get.
, you can do it better.
), blocks etc are accounted for as mining was not affected. 
