8-ball,
If you read the thread over at Extreme systems by Morphling1 he said he tried real narrow channels and got higher temps. But I don't recall just how narrow his were. I know he had 14 channels at one point though compared to the 10 he uses now.
I'd say Cheeseballs 1/32" should work pretty well. And all that extra wall friction if not for better cooling will just increas your head loss. Even reduced to say 30 channels that is a heck of a lot of small cuts.
Will need a heck of a pump.
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