[mad mikee]

I've done just enough tinkering to be dangerous now, and have gotten 2 things from experience on earlier systems.

1. Splitting up flow into the various parts so that they all get coolest water did make things run just a little better. (2 y -connectors from wherever to the CPUs wouldn't appear to clutter your setup from what I see here).

2. You want the max pressure into your CPUs (and if you are splitting this of course is even more true) and while the flow may even out around the loop, there should be a point of max pressure / flow right out of the pump head. Also you take a flow/pressure hit in every block (think of smashing into brick wall and then reversing direction). 2 of those in a row will slow down the flow more than 2 in parallel?:shrug:

Lack of sharp turns is very good.

3. Check out the Article on Maximizing flow rates as it would also apply here.