[Long Haired Git]

Next issue is that Swiftech Storm C/W graphs do not include the TIM. I thus use Robotech's testing from systemcooling.com (with permission).

So the C/W for the Storm you're using is out.

Right.

Single MCP655. 4.4 LPM. Dumps 13.3W into the loop.
Rad MCRP220QP with 2 fans @ 12v: C/W = 0.0361. Coolant at exit is 8.65°Caa
Storm on 110W. C/W = 0.1404. CPU temp = 24.1°Caa
GPU 1 on 70W. C/W = 0.186. GPU temp = 22.0°Caa
GPU 2 on 70W. C/W = 0.186. GPU temp = 22.25°Caa
Approx 1.5m of tubing

Add in a second MCP655
Dual MCP655. 6.0 LPM. Each dumps 13.73W into the loop.
Rad MCRP220QP with 2 fans @ 12v: C/W = 0.0348. Coolant at exit is 9.0°Caa
Storm on 110W. C/W = 0.136. CPU temp = 23.9°Caa
GPU 1 on 70W. C/W = 0.18. GPU temp = 21.8°Caa
GPU 2 on 70W. C/W = 0.18. GPU temp = 22.0°Caa
Approx 1.5m of tubing

So, 0.2 degrees better. W00T!
The coolant temp is still hot, even with dual fans @ 12v.
Instead of the MCP655, lets add in another MCR220QP with fans @ 12v.

Single MCP655. 4.25 LPM. Dumps 13.29W into the loop.
Rad 1 MCRP220QP with 2 fans @ 12v: C/W = 0.0363. Coolant at exit is 4.54°Caa
Rad 2 MCRP220QP with 2 fans @ 12v: C/W = 0.0363. Coolant at exit is 4.12°Caa
Storm on 110W. C/W = 0.141. CPU temp = 19.6°Caa
GPU 1 on 70W. C/W = 0.187. GPU temp = 17.5°Caa
GPU 2 on 70W. C/W = 0.187. GPU temp = 17.8°Caa
Approx 1.5m of tubing

You can see that makes a much bigger difference.

In fact, I'd drop the fans back to 7v and suffer the one degree drop and instead enjoy the quieter fans:
Single MCP655. 4.25 LPM. Dumps 13.29W into the loop.
Rad 1 MCRP220QP with 2 fans @ 12v: C/W = 0.05. Coolant at exit is 6.4°Caa
Rad 2 MCRP220QP with 2 fans @ 12v: C/W = 0.05. Coolant at exit is 6.0°Caa
Storm on 110W. C/W = 0.141. CPU temp = 21.5°Caa
GPU 1 on 70W. C/W = 0.187. GPU temp = 19.4°Caa
GPU 2 on 70W. C/W = 0.187. GPU temp = 19.7°Caa
Approx 1.5m of tubing