SC = Superclocked, that card comes to you already overclocked.
There is no reason to get angry at Strategos, he was trying to be helpful and I generally agree on what he proposed you to test.
That said, as Cuddletronic suggested from the Crash reports, the issue seems to be related to graphic drivers crash and I think I might help you on this case. I have a suggestion for you since I have an EVGA card (a GTX770 Classified 4GB) which is, like your card, overclocked by default from EVGA.
PLEASE REMEMBER THAT YOU DO THIS AT YOUR OWN RISK, I TAKE NO RESPONSIBILITY FOR EVERYTHING YOU DO.
I had exactly the same issue you seem to be having with completely different games, random crashes that made it impossible for me to play them. The crashes were completely random and unrelated to the graphics details, so I can't say exactly why they were happening. But I solved them ENTIRELY in a very easy way, which is by downclocking both the GPU Clock Offset and the Mem Clock Offset to the default values of the standard GTX770. So, maybe, this could work for you too, if you are willing to test:
1. Download EVGA PrecisionX, it's a program made by EVGA to overclock/downlock the card and monitor/control many other parameters (You can do it from Steam directly, it's free)
2. Check on Internet the standard frequencies for the Titan Black or for the basic Titan
3. Run EVGA PrecisionX
4. Set both the GPU Clock Offset and the Mem Clock Offset to the default values of your card (in my case, with the GTX770 Classified 4GB, I reduced them both by 105MHz, in your case it might be different tho)
5. Hit Apply, close the program and run COH2
6. Everytime you turn off and then on the PC again, repeat the process from Step n.3
I hope it will be helpful, gl if you decide to try this way.
If i would change anything on the graphicscard, the guarantee would be not active anymore, so i dont will try this. After all i havent any crashes in other games, and I havent any crashes like this before the new addon was available, so at least i could say its not a problem from my system. its a problem from the game. I have also problems with my second system which isnt overclocked with an Nvidea 680gtx.
But thx for the help. Hope I get some informations about relic soon.