I probably should've figured that out on my own But anyways, I was thinking if I do that then water will hit only one core before going back to the I/C. yes, flow will be faster, but only water only hits one core or the other before going back.

I was kind of thinking slower flow (still faster than stock) and the hitting of both cores before going back would be better.

Obviously all of these questions depend on the unique differences of each setup, plain and simple, so I probably need to look at my options for my setup in particular. But I'm just trying to get some good opinions here before deciding... Does the slower flow hitting both cores seem better?

Because the other issue with dual flow is one core will be in the lower grill, and one in the upper grill, so only the core on the top will truly be getting great cooling.