report what the pool web GUI says, don't believe cgminer
Did you actually read what he wrote?
ah, well, yes, just replace "cgminer" with "reaper".
did you actually check at some pool? if the pool actually gives you the coins for a hashrate of 1200 kh/s you might have the best 5970 in the world. I just want to rule out that it's a simple display error on reaper's side.