Agree Bluebricked, Emil's kit looks a great bit of kit and would love to fit one.
Very poor of Morgan to filter the fuel on the return to tank line but done so that they could use a cheap combined filter and regulator i guess.
The S&S X Wedge catalogue I've seen shows the fuel feed pipe go to a Tee between the injectors and is a non return supply.
As you know In the 3 wheeler its fed to one injector then across to the other then back to filter/regulator. With the amount of flow from the pump i would be surprised if the amount of fuel and pressure to each injector is unbalanced plumed this way but may be wrong of course!