APeregrina

Hey everyone, I posted to /r/buildapc and didn't get much advice at all. So, hopefully you guys can help me out! I'm new to crossfiring and currently have two air cooled XFX R9 390s in a Corsair Graphite 600T case with the mesh siding. Right now my current fan layout looks like the attached picture. My lower gpu is idling at about 35-37C and my upper GPU is idling at about 45-47C. My CPU has a Corsair H55 closed loop on it and is idling at about 30-32C. I'd love some feed back on the current set up. Is there anything I could do that would help cool that top GPU or is the GPU on top always just going to be 10C hotter than the bottom? Now, normally I know you don't want intake coming from both the front and back, but my CPU radiator is attached the the back. If I flipped it, wouldn't that mean the radiator would be fed hot air from the GPUs, which would be bad? Also, if I should flip it, should I have all four fans on the side panel as intake fans?

favorite thing has got to be that cool case that's come with it. I use a nokia lumia right now and the glance screen is actually pretty cool, this is like a better version of that. (ignoring battery concerns)