Cathar is correct in what he states. You have to think about it on a molecular level. The water temp will rise maybe .2C. Which means it allows more water molecules(alot considering 6lpm) to come in contact with the heated surface. This is why turbulance and velocity are just important as flow rate. Narrowing the slot even more will be a benefit to cooling performance but depends on how well the pump can push it. A stronger pump can use a even narrower slot. Depending on what pump head, flow, pressure is how narrow the slot "can" be up until the slot is so narrow it decreases the flow and effects the block itself and other blocks in the loop. Then you have to think of added heat from the pump from it working harder to push that water through a narrower slot.
You only can make it so small till you see deminishing returns. That's true with making the slot bigger too. It's a very fine balancing act and Cathar put alot of thought and work into it. LOL I'v tried it doing it the home brewed way and it's not easy.
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