Copo Rat,
You need to look at the valve events in each port, not the firing order, to figure out the fuel robbing issue. When #2 intake valve is closing #1 is just starting to open so you need to inject fuel at the right time to each valve.
With a carb you have a manifold full of fuel to help crutch it by until you reach a critical point ( about 400 to 500 HP ) then you have a problem because the supply can't keep up with the demand unless you run it very rich and kill the power. This is a simple explanation.
I use carbs, so my fix was to divide the ports, if you don't 1&6 will run lean.
Maybe if you put the injectors up stream it will fill more of the runner and help?
Harry
