If the inlet is simular to the one on the block you sent me, I think it could do with being much thinner, 1~1.5mm to start then try upping it 0.25~0.5mm a step to find your optimum. As it is it's only 'spreading' out the flow, not 'jetting' it, which is probly why it perfoms on par with the maze3, you're not actualy getting any impingment...
Ask Cathar how wide the channel/jet was/is on the WW. It'd have to be a bit thinner on yours to make up for the extra width...
PS, I was'nt joking about buying the Maze3 if you're interested?. Half what I paid for it 5 months ago(£45) and the block you sent me would be fine, or better still some 5mm copper bar (I was planning on cutting the maze up to make another block but it's only got a 3mm base plate
)...