Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
I run prime+fur at the same time when testing. Have run them both for over 2 hours one time to see what temps I would get on my new wc loop. (plus I had to wear in the thermal paste...)
imo, water cooling is your next best option...
a RX360 rad would have enough surface area for both GPU's. I used to run a 6970 on a 240 slim rad but it wasn't enough when I added my Q9400 to the loop.
The 6970's are awesome for their price. I bought one about 3 weeks after release for $425 including postage and it's still going. I'm actually trying to get a second one from Overclockers Australia (OCAU) forums because they are just that good :D