I think I should point out that the Via Aqua 1300 actually has a lower gph rating than the Via Aqua 306. I know I was unclear about this for a while when I was pump shopping. It just seems to be the way that the company labels their pumps.
Anyway, switching from the 306 to the 1300 would probably help your temps because you would be downgrading the spec. flow rate and downgrading the wattage of the pump as well. Your Via Aqua 306 wants to move the water pretty darn fast, but the backpressure from the restrictive water block hurts flow rate. So now, the energy the pump would have used for it's fast flow rate is wasted. It gets dumped into the water as heat.
I'll bet if you use a manifold and branch off to cool your north bridge, vid cooler, etc. you would actually get better temperatures. The manifold would open up flow a good amount. Then the pump can express more of its power as flow rate, rather than heat. Right now, I have a tiny little 105 gph Via Aqua 360 pump that powers a system with 1/2" tubing and a seperate branch for the NB and vid card. When I branched off the NB and Vid card, I saw an improvement in my cpu temps.
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