Those are the thickest radiators I think I have ever seen in my life. Between those, and the reservoir in front of the front-mount 360mm one, there is definitely poor air flow.
Those rads aren't even that thick you should Google the Alphacool 60mm rads.. those are some thick boys.
As long as you use good fans, you don't have much of a problem (granted, thicker the rad, higher the rpm you'll need regardless). I don't even run push-pull on my Heatkiller 360-L and I can run my Noctua A12x25s as low as 1000rpm and still get good air through the rad.