It's all good... BillA is in a better mood at the OCAU forums, check it out!
The pump efficiency thing is a moot point. My take on it is still that you are pushing your rad with too high a flow.
To prove it, you could install a bypass to your rad, where you'd connect the inlet and outlets together, through a ball valve: leave the valve closed, and you've got full flow through the rad. Open up the valve completely, and you're almost completely bypassing the core. Somewhere in the middle should be your goal.
I don't know if you're willing to try this. It'll cost you a couple of T's, and a valve ($3-4 ?).
The bonus is that you'll achieve an even higher flow rate, since you're reducing the flow restriction from the rad. That's what I call proving a point...
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