The 769 gh's is being paid more because of backpay for mining shares  of CPPSRB mining shares owed from slower rounds as you see it is under 100% you have a little over 5% in backpay shares owed to these miners so the pay will usually be higher depending on pool luck and what the pool can pay out as your other rig is running @100% paid shares and 100% is the max you can ever earn  and have no shares owed so they have  been paid the max earning of what paid shares are atm and not owed any backpay for mining shares of CPPSRB from slow rounds.When the pool doesn't find a block in allocated time the 100% will fall under to 99% 98% etc and mining shares that you could of gotten paid rollover and get paid out the next block so you earn the max pay per share  you will then get paid for the work of the past block that took longer but was beyond the pay thresh hold of the past blocks of past shares if owed depending on how slow previous rounds were if there were no slow rounds during mining then you are owed nothing and you remain at 100% with no back  pay as you earned full pay per share. If a round takes 3 hours to find a block and a block should be found in 2 hours? those extra  mining shares that it took to find the block then get logged too cppsrb shelved shares then if the next block is found in 5 minutes instead of getting paid for just 5 minutes of mining shares you did you get paid for the extra hour of shares from the previous block or blocks from shelved shares of the past the 100% drops to 99% 98% etc then get paid during the  next luckier rounds rounds if they fall below the 2 hour mark on luckier rounds and adds a extra .01 + from shelved shares or so depending on pool luck and what it can pay averaging out to max pay per share in the end.You wont ever get paid more than pay per share you did.