I found splitting a single loop into 2 reduced my GPU temps quite significantly. From memory the loop was:
Res-Pump-Rad-CPU-Chipset-GTX480-GTX480-Rad-Res
In splitting it into
Res-Pump-Rad-CPU-Chipset-rad-Res
and
Res-Pump-Rad-GTX480-GTX480-Rad-Res
I managed to incorporate 2x2.120 rads in the loop, but more importantly the GPU's went from 60+ under load to 45max under load.
You should see something similar....
Cheers buddy. Need to save around £250 and I can finally finish this. Sorted all my monitor and pc wiring out yesterday. Took me ages. Ill post a pic soon