that's due to them being attached by zip-ties.
also i'll be dammed must have placed the rear fan wrong when i installed that H100i rad.
also most heat keeps "hanging" between the two cards so to speak so i was thinking of making a sort of wind tunnel to blow that directly out back pci-e brackets?
as for bottom fan idea i thought of it but the effective surface of such a fan would be +- 20% of the actual fan size)