Cathar:
I was reading over the OCAU thread last weekend and noticed one thing:
You stated that your nozzle opening was 5 x 15 mm, for a total area of 40mm^2. However, 5 x 15mm is 75 mm^2, but I understand that you have 8 channels that are 5 x 1 mm, which totals 40mm^2.
The thing is: you didn't nozzle the flow, you merely tried to distribute it better among all the channels. I was under the impression that you nozzled it, where the opening that you created was smaller that 40mm^2, which would have created an increase in coolant speed.
Did you consider reducing the opening to say, 2 x 15mm?
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