Put on all T5x24 , run the 4-12 version , overclock them to 1250mhz core and 3100mhz ram and you will have about 300 for all. And run x86 version the most important.
I have 6x750ti overclocked and set to T5x24 and that is the optium , If you try all different cards with different setting you will end up crazy.
wow that worked and they were all mining around 270 base clock and then within a couple minutes it started failing so I think I'd maybe need to change the clock speeds like you recommended. How much do I add on top of the card's clock speeds do you know? I'm using EVGA so it's either plus or minus clock speeds and not set clock speed to x amount.