improving your mining power by up to 15% by simply running an additional script and light weight software package
That's a pretty bold claim right there. So a stock S5 will get 1328Gh by a script?
The Radiators are designed improperly if you ask me. In fact their curved blades in my opinion trap heat rather than expel it.
Running the unit vertical would do nothing but improve the thermodynamic cooling ability of the radiator allowing heat to escape the way it wants to. Up.
They're designed EXACTLY to trap the flow and prevent it from escaping. You want that air to continue down the entire length of the blades before being allowed to exit, else you end up with an even larger temperature gradient down the blades. The curved design also adds significant surface area [heat transfer] for the same amount of material and volume.
As a last point, passive convection effects are almost negligible in regards to heat removal when you have active convection operating.