One suggestion I have to you is to make the fins connected to the centre. That way they should pick up more heat. But that way you'll be sacrificing flow.
Have you got some dimensions? I think the outhermost fins are superfluous (not necessary).
I think 2 outlets will be the least you should have on this design.
Just remembering now, you once sent me an email regarding tubing and where to buy it.
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My Past System
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