Actually, it's a myth (maybe pH should add it to the list) that flow decreases, the further away it is from the pump.
If the pump creates 100 gph flow, then that's the flow at any point in the system, but since the diameter of every point in a rig is not the same, then the flow speed changes, but never the flow rate.
What changes at every point also, is the pressure: as the water is restricted through all the points, there is a pressure drop, relative to the pump outlet. Each one of those points creates turbulence, and that would be where the pump heat comes from. Otherwise, pump heat comes from the impeller turning around but not moving water as fast as possible.
So although the pump itself produces heat, so does the blocks restrictions. Just out of curiosity, is there a 90 deg bend at the outlet of your rad? Look closely: is the rad barb a 90 deg bend from where the water comes out of the rad fins?
I'm unable to otherwise explain why you would get better results with pump -> CPU -> Rad, versus pump -> rad -> CPU.
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