A 1000khs should net you 200k in what time frame? I certainly won't get anywhere near that and will be lucky to get 100k at 750khs extrapolating my current steadyminer payments. More like 90k so if I was mining with 1000kh/s I'd get 120k from 24 hours with steadyminer.
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You should be checking your rejection rate and hardware errors. 750khs means nothing if your card isn't properly tuned. My rejection rate on steadyminer is 0.17%, much lower than the pools.
So far I have made 240K with 2200kh/s, and I have only been mining steadminer since 1am EST, so that is 13 hours worth of work. Steady miner does not give rewards for finding blocks, instead the pile is divided evenly, so you do the math.