hmmmm......
Perhaps your block is clogged? Rare problem, I know, but it is worth considering.
Check list:
1. Proper mounting: Check
2. Proper routing of tubing: Check (I'll take your word on this, no kinks etc.)
3. Waterblock is functional: don't know yet
4. Pump is functional: don't know for sure (RPMs doesn't mean 100% that the pump is working)
5. Rad is functional: probably, as your water temps are good.
Where are you measuring your water temps from, btw? Yeah, those MOSFETs are hot little suckers, and the PCB conducts heat, meaning that if they run hotter than the CPU, they will transfer some of that heat to the CPU (ironic, isn't it?). If you have good airflow through your case, and heatsinks on the MOSFETS (I know the plastic doesn't act as a heatspreader, the MB does, but it still helps) you shouldn't need a fan blowing directly on them.
You might have a crappy diode. On an epox 865 board of mine, my CPU temps on a 2.6c shot up when I installed a swiftech MCX 478V from the stock cooler. The temps went from 35C all the way up to 69C! Sometimes they will plummit to 0! Yet, somehow I was able to push the chip from 2.9ish with stock to 3.2 with the new heatsink. Diodes can be tricky suckers.... don't trust them.
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