This should be solution for all NVIDIA Founders Edition.
Many people bought cards and even think to back them because high temps.
EVGA Solution is nicest on market and proven with Maxwell generation, people were very satisfied last year.
http://www.evga.com/Products/Product.aspx?pn=400-HY-5188-B1
I suppose Founders Edition is maybe useful only with 80+% fan speed.
With such card in hand you need to risk, even if manufacturer don't allow customers to change nothing.
99% will nothing happen if you pay attention. I advice to people to use some cloth over screws if it's possible, and exactly proper size of tools, than screws will not be damaged... different thermal paste will not be problem. MX-4 is one of best and available everywhere.