Just tried the -H 1 -i 0 -m 1 -l K14x16 on my 670. Went up about 50 KH/s on each card. I do see my CPU went up from around idle to about 50% usage. Also the accepted lines that I see now read 100%. Before that would read 99.50% or around that. (not sure if that is better or not)
On a side note: Does anyone have a link that explains the readout you get when mining? Like the lines that scroll.
And thanks for the update. Will run now for a while and see how it works!