I'd say your right about flow rates Bill (as usual)
I did a little rough test, and I'd estimate flow rates to be about 130 - 180 L per hour. This running through the taps to the outside of the case (No straight through, so another 2 90 D bends on each side of the pump). So I'd estimate flowrates might be 160 - 210 or something.
I also borrowed a Cyclone 5, which generally performs about 5C (approx) better than my Surge, or so I've been led to believe, very little change.
I'd say Im getting bad temps due to my low flow rates, and also Im dropping a fair bit of possible airflow through the rad due to the pump and then fact that I've only got a shit shroud, which is restricting the fan.