Do you already own an aquaero? If so, which variant?

At least you should have the newer passive heatsink installed or even better: get the water block One thing you also need is the latest firmware which should be available this Friday. It changes some things on the temperature control for the voltage regulators so the overall power will be significantly better.

It should be no problem that your fans need more power when spinning up since the aquaero has an integrated function to allow a short overload to ensure that pumps or fans start correctly. This overload is fully monitored through the device so it is safe. The only problem that you might encounter is that it will not work at all if the power draw is too huge. In this case you can try to rearrange the fans on the fan outputs or to get an poweradjust 2 (standard variant) as 5th fan channel.

OK, when you order now the aquaero XT already comes with the larger heatsink.

Each channel can take a load of ~20W but the total load of all channels combined should not exceed 60W.