Can you see PA2 as a fan in Aquasuite?
Like the picture in the attatchment - it should show up as fan # 5 (I have 3 PA2s as Fan 5-7).
My D5s are on fan 5 and 6, I have a minimum power of 35% and use a startboost of 100% in 2 seconds.
I use a preset controller to control the voltage and have the 3-pin from the pump (rpm) connected to the PA2.
If you can't see it, then you probably need to assign it an aquabus address using a direct USB connection and aquasuite 4.72.
Don't worry - you have a great setup going