I have/had that setup (the wc parts are now in a box in the attic but I still use the case).
It did exactly the same thing to me - if you leave the fans on auto speed.
Try setting them to something like 5 or 6 manually and see how your temps do.
That dropped my idle temps by about 5C. Load temps still sucked. It's the pump I'm sure of it - the flow rate is dire at approx 0.5gpm. The "upgrade tank" puts a DDC3.2 pump in there instead which would help A LOT.
HTH
J
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