the model the PCWiztech give us is for a 4x4 gb kit and they have a XMP profile. Corsair don't give info on the command rate (2T) 2N
Vengeance® Low Profile,
I don't think you sticks are bad, they are bad when you combine 4 of them, my guess is you will have 0 issues with any 2 of them, try to adjust the voltage and the timing, or best of all, get the RAM I link, Asus ROG forum as a nice BIOS tuning guide for the Maximus V, you can look at it it's a lot simmilar, you can see on the 5th line the Dramm command mode 1T (1N) 2T (2N) that AKG and I talk about
ASUS Z77 Motherboard UEFI BIOS Tuning Guide - Republic of Gamers
for the voltage they talk about it here
ASUS Z77 Motherboard UEFI BIOS Tuning Guide - Republic of Gamers