I added the Maze4 GPU after modifying my loop to accommodate it. I went with a longer length of tubing that could make the bend without requiring a 90. I did have to mount the side fan externally due to lack of clearance beside the card. I used AS5 in place of Shin-Etsu this time and loved working with it.

Both radiators remain in parallel. My load temps running two instances of folding 24/7 are 26c. I started to hit 30c with the Shin-Etsu, which could be attributed to my last mount or a thicker uneven layer of compound, (that stuff is hard to work with). So to sum it up parallel seems to be perfect for my system. I'm so happy with the results I'm not going to bother with dual loops or running the rads in series.
Thanks for all the knowledge Pro Cooling. I learn so much here it's almost scary