What kind of numbers are you getting?
You say you aren't getting very good results - what do you mean? What's do your temp numbers look like? c/w?
Secondly, what are you comparing your numbers to? Do you have a dangerden or a nano block that's giving you better results in exactly the same config?
Having asked all that, the fact that you've got multiple flow channels means the waterflow is going to choose the path of least resistance. Water that flows into a higher resistance channel may end up stagnating and since water doesn't conduct heat well, that could create a hotspot.
One way you could diagnose the issue is measure the block's temperature with either an optical probe that remotely measures temperatures or, if you're lucky, a video camera that has an ir capable ccd. Sony used to make a camera like that that some folks used to look at women. The camera showed the heat flux, not the clothing. The camera will give you an instantaneous reading across the entire surface and tell you if you've got stagnant water inside the block.
If you've only got an optical probe, then you'll want to divide your block into a matrix and measure the temperature at each square in the matrix. Record the temp in each square on graph paper and that'll give you a numerical equivalent of the video image.
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