As you can see here:
The PSU fan blows air into the PSU which then is forced out thru the back of the case... it is not blowing air out thru the bottom unless they built it wrong..
http://www.newegg.com/Product/Product.aspx?Item=N82E16811352049
Front: 2 – 120/140 mm fans (included is 1 Fractal Design Dynamic GP14 fan, 1000 RPM speed)
Rear: 1 – 120/140 mm fan (included is 1 Fractal Design Dynamic GP14 fan, 1000 RPM speed)
Top: 3 - 120/140 mm fan (not included)
Bottom: 2 – 120/140 mm fan (not included)
Side: 1 – 120/140 mm fan (not included)
As the case came with a rear fan, and only fits one rear fan, I don't quite understand how you added one unless you first moved that one to the front.
W/o doing a fog test, or seeing a pic, it's difficult to get an idea of what's going on but I can only guess that you have somehow created turbulence to shifted things around such that you created a dead zone under the card. I normally use a fan installed on the back of the HD cage blowing between the two cards on an SLI setup but I have not seen the result you have encountered before. I hate to ask but are you sure the fan is blowing In ?
The PSU in the above pic is upside down, so if you look down at the fan you installed and the blades look like that, its blowing down. The blades should look like when you cup your hand to sip water out of it.
If you look down and see this, turn it over
if you look down and see this, you're good