You need to have the pumps maximum power set to 100% in the pump tab of the Aquaero menu, plus you need whatever controller you have the pump assigned to set to 100%
If you just have max set to 100% in the pump tab, that is just the max it can go to. The controller tab needs to be at 100% to actually make it run at full speed.
If the controller tab is at 100% but the pump tab max is set low then even if the controller is at 100% the pump can't run higher than its max speed setting. It just runs at 100% of its min and max speed settings, or 50% of its max speed setting etc.
To get the pump at full speed you can just set it to 'Maximum power' on the pump tab instead of 'set by controller' or Manual Preset'