Final final update!
SO! I think the issue was actually the Motherboard. A couple weeks ago, I got random power failure with my Corsair PSU which has been running great for some time now. I did some research (not sure how I didn't discover this before) and discovered that the ASUS Surge Protection "feature" on my motherboard has been the source of TONS of frustration for the PC building community!
I turned that crap off.
So far, no further power failures. My guess is that since this typically happens during gaming sessions when I am using my new GTX 970, the motherboard is hitting an undervoltage due to the power sucking graphics card hitting some sort of major processing point. Asus needs to adjust their tolerances in my opinion. It seems like this is a pretty common issue and I no longer am taking advantage of the feature that may save my PC from OVERvoltage some day.
I think the difference between the EVGA and Corsair PSUs may actually be a factor as well. Not speaking from an electrical engineering perspective, but from a purely diagnostic approach, I would almost have to say that the Corsair PSU seems to be able to handle spikes and dips better than the EVGA PSU. Since it has taken over a year to surface and factoring in component degradation over time, I think the Corsair PSU is probably degraded to a point where the components have an equal quality level to the EVGA PSU when new.
This is purely conjecture but that seems to be the case.
Well anyways, I'm back to gaming again!