I'd suggest putting the res right in front of the pump and using larger ID hose to connect the two. You want to make sure the intake side of the pump gets unrestricted water flow. Otherwise you are getting rid of some of your potential water pressure for no good reason. Doesn't really matter where in the loop the pump is placed.
Splitting the flow in half will result in worse performance for the GPU and NB blocks perhaps, but if you split into two loops for those blocks and just put two barbs on your res rather than using a Y then you have probably lowered the total flow resistance from WW to res. Combine that with the fact you can do a much neater job of routing hose and I think it's a pretty good idea.
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