The reason it did not work is you cannot prime the pump with the
check valve in place. Thats why it worked once primed and the
check valve re-installed. We need to add that to the instructions because it always comes up. Once primed the pumps reverse flow
check valve keeps fluid in the head.
Yes you will get even distrubution remember you have 100 of CFM of air passing through a pipe less than 3" ID as well as well over 150psi of pressure from the pump.
You can use the Map sensor for the controller to read as you boost reference. Just make sure it's the same bar as your controller. If you have the voltage face controller use the activation lights to set your points.