I've assembled WC and still testing but couldn't help myself to share fantastic (in my standards at least ) flow results.

Now I'm getting:
405 l/h (1.78gpm) - 3 pumps
325 l/h (1.39gpm) - 2 pumps
210 l/h (0.92gpm) - 1 pump

The best part is.... that's with GPUs in series!

So the gains are:
From 1 to 2 pumps - 50%
From 2 to 3 pumps - 28%

All this with the following changes:
1) Removing 2 EK ASUS X58 mosfet blocks and 1 EK ASUS NB/SB X58 block
2) Removing remaining 12x 45s - now I have only straight fittings and tubing
3) Replacing Supreme HF (rev 1 I think) with rev 3

So finally I have completed my personal quest for decent flow

Tomorrow I'll finish the wiring and do some photo session - so watch out - eye candy incoming