Terramax got it on the the nose. The inlet should be on the sides, inlet bottom, outlet on top. Very important on a large passive rad.
43 watts of pump heatdump is a large amount, about the same as a gpu not under load. 28-30C room temps are also pretty high 80-86F. I would say nothing is wrong with your temps. 100% normal and having mcp350's will improve those temps.
I would love to see temps of this passive setup when you set it up
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