So I don't know why my rigs don't hash at the same rate as others here. I maxed out the diff setting on Prohashing and that didn't seem to change the behavior either. So unless I am just consistently unlucky I am at a loss to explain my low hash rates.
Try more voltage. I've had them up to 830Mv over days (during the B1/2 firmware crisis) with no problems as long as you watch temps.
I suggest you try something like 822Mv @ 1224 Mhz and change nothing else for 24 hours and see how that goes. Then try 825Mv, 828, etc
Also what temps are you running at? I doubt this is the issue but Inno have built in some throttling to prevent cooking the cards so it may be a factor, I know mine do seem to run faster overnight when it's cold.
Also I forgot to add that I have the fans poking through a wall into another small storage room which I use as an exhaust chamber. I've got some fans mounted on an external wall of that room that then suck the air from that room and blow it out into a very large industrial building (keeps it nice and warm). The key point is that the miners are always getting fresh cool air in the intake and blowing the hot air into a different isolated space.
This helps keep them cool which does seem to make a difference I got this idea from Youtube (see Bitcoin Master), and it's helped a lot.
The thing I've learnt and continue to see is that it takes a at least a day to see any real changes when you're looking at ProHashing's console, due to the natural variation that comes from mining on a multi pool, so it's difficult to really gauge the effectiveness of your changes unless you monitor for at least 24 hours before making another.
Good luck.
