Then I assume you have 3/8 inch on the GPU. That in mind I'd think you were fine because the added restriction on the GPU would balance out the large restriction from the Maze itself.
Assumeing you are getting good contact with the core, which I think you are because of the very low idle temps, I'd assume you just need more flow to prevent heat from building up in the CPU block. You could add a larger pump, but thats probably a waste unless your current one is crappy. What I would try is to add some additional restrictions on the GPU block so that more flow hits the CPU. Compared to the CPU the GPU heat level is nothing at all. Kinking a pipe heading in or out would probably do little at all to its temps and could lead to a large improvement in CPU.
I'd kink the GPU tube a little with a twist tie and see what happens to CPU temps. If it doesn't make a difference then unlink it and we'll go from there.
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