I did have Corsair Link and the USB dongle installed (which was kind of a pain to do in Windows 8.1 actually), and it always reported 2000RPM at the pump. If it's a kink in the tubing, that's not something that can be easily fixed because I'm working with very little space to begin with, so I can't really rearrange it in a better place.Use the Corsair Link Software to determine if the pump is working. Just hook up the USB from the block to the motherboard and plug in the SATA power to the H80i. Open up Corsair Link, if the pump RPM is below 2000RPM its probably the fault.
Yes you can use other fans on Noctuas. What CPU do you have?
CPU is the 4770K.