It sure looks like the waterblock is basically supporting the weight of the Eheim pump as it hangs in mid-air like it is. This is exceptionally bad in terms of getting a proper even mount of the waterblock against the CPU.
You tried a few remounts? Ambient temperature was the same before and after?
Oh, and yes, without fans and with fairly restricted radiator air-flow, ~8C above case temperatures for the water does sound quite plausible for a 1048 pump to heat the water by.
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