Edit: Are you sure the pump lead is properly connected to octo 8?
Yep, I unplugged and re-plugged to check
the pump draws power from the molex plug, not PWM, so you won't see any power reading.
And the EK DDC PWM range is 0-50% on the controller, so you have to set the maximum power in the octo output to 50% so that when you set it to 100% in your fan curve, it applies 50%
Oh really? How do you find that out? Seems odd that it didn't used to be an issue (unless I'm an idiot and never noticed it...)