Ok, So basically since I have 4 of these 750ti in one machine, They will only run ~8.5-9kh/s each.  I guess that makes sense, although I'm not sure why

I use the gigabyte z87-OC, and i know the first three pci-e slots run through the CPU, but the 4th runs through the north bridge (or south?).  Maybe thats another thing to think about?