You're recirculating back into the BK but what is the temp of the wort coming out of the chiller? The whole one pass thing requires the coolant to be run almost wide open while the wort is throttled to about half. At least that's what I've seen with smaller chillers like the Shirron and the one you got. The output of the chiller can be run back to the BK for as long as you want, but I'd only do so until you verify the output temp is low enough, then reroute to the fermenter.
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