Just out of curiousity have you tried dropping the stock cooler back on and give prime95 another test? See if maybe something is wrong with the cooler.
I actually am debating that right now. I could not see where anything could be wrong with it but HELL at this point I am desperate and stressed about this!
Update: I put in stock cooler and it idles at 42c and I shut of Prime95 at 71c... ERRRRR!!!