Sorry, I should have said "My" CTDs fixed...I got a bit excited I finally fixed it.
Idle temps of 60C and are not that off, and running temps in the low 80s its also not at all absurd, the cards have reported to downclock at 115-130C, not that I would ever suggest even letting things gets that bad.
In fact the same card runs other games at the same temp with lower framerates. This leads me to believe the video card has in fact been pushed harder and never resulted in CDTs with other games.
Ultimately its a hardware issue being triggered by some unforseen demand on the GPU, this I understand.
I also understand there are several possible causes leading up to CTDs, this was just an easy suggestion for those who haven't tried.
And thanks Rally, much appreciated!