No one block per 24 hours.
1.81 Mh/s x 6 280x ~ 10.85 Mh/s
sgminer -I 19 -w 256 --thread-concurrency 8192 -g 2
Anybody know better config?
Variance is horrible when you have so little of the total hashrate (10.85/3780=0.29%). I have only 24 MH and can go 12 hours without a block. And the network almost doubled in the last 24 hours, so patience is needed. Over a week's (or more) time, it should even out somewhat. Your setup seems fine, you can always play with clock speeds and overclock to 1100/1500 or whatever your card will handle and get 2.00 MH out of each card.
sgminer -o 127.0.0.1:41677 -u xxxxxx -p xxxxxxx --thread-concurrency 8192 --lookup-gap 2 --worksize 256 -I 19 --gpu-fan 45 --gpu-engine 1050 --gpu memclock 1250 -g 2