So to revisit this build after some time living with it. Everything has been working great, except the corsair link. I couldn't recommend this to anybody. I've given it a fair chance and after 2 months of failed attempts to fix issues with the lighting and fan control, it's going in the bin.
The problem with the lighting has been no matter what I've tried, the lights flash to full 100% brightness for a split second every 10-15 seconds. If you have the case sat on your desk as I do, this is irritating beyond measure. I've tried various driver versions but all have the same issue and tried firmware updates but they always fail to install.
Fans randomly speed up and slow down regardless of the fan speed profile, and now all fans have vanished completely from the group software so I can't control the speed of any fans, they just go at random speeds.
I'm not sure if this is an issue just with the motherboard I have, but I've tried everything I can to work with this hardware and now I give up. I've got a 20oz claw hammer that's itching to meet with this awful corsair link commander.