Why does everyone assume this block depends on laminar flow? It's really not all that small inside (total cross-section area), there is a very sharp bend upon the coolants entrance to the block where it slams into the base and then is pushed out of the way by more coolant coming down. Do you really think that the flow smooths out that much in the 1/2" it travels before it's over the core?
I would try making it a bit wider (say the inside-width of the channel should be about 4mm wider than the CPU core - so a 2mm + sidewall width overlapp on each side), perhaps score the bottom parallel to the flow (scoring perpendicular will likely just create tine deadspots in the bottoms, and I don't think the turbulence around the peaks makes up for it), perhaps score the top perpendicular to flow to create turbulence and dead-spots in the top don't matter.
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