You might underclock your graphics memory. It isn't used (significantly) by mining and underclocking has been reported to actually increase total hashrate.
Are you mining in a pool? The numbers refer to shares, not blocks. The number of shares you produce is approximately proportional to the amount of hashes you contribute to solving a block, so mining pools pay you based on shares. I may be wrong, but I think shares are simply blocks with an artificially low difficulty. The number in parentheses is, I think, the number of shares you have produced in the last hour.