Slap me if I'm wrong, but I seem to remember that running a centrifugal pump, it is a lot more efficient to push than to pull. With the res before the pump there is no resistance to water being sucked into the pump ... that is the nature of the res. With the res after the pump, turbulence is created in the res causing a dramatic loss of pressure. If you thought your 2x90deg bends were bad, that's nothing compared to what you introduced by putting your res where it is. You need to turn your pump around and have it pump the other way. You can blow all the air you want over that radiator, but it won't make up for the dramatic drop in flow rate through the entire system. Swap flow direction, and be amazed when your temps drop by 6-9C (estimated). That isn't a theory, that is based in solid mechanics. If you flip it, good temps will come.
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