you not having enough length with the 8 pin cable seems odd i'm pretty sure that my cm storm sniper is taller than the 690 and I have an XFX psu too and I can fit the 8 pin (with a struggle!) up to it with the psu fan facing up
CPU cooler is tilted wrong way.
So, you think I should resit the cooler 90 degrees to the left? so the fan is pushing the air thru the cooler and out of the case? Would doing this help with the overclock?