Accel 7 tuning

[MrForce]

One more to add to the list:

If you know the Fuel Pressure is good (same) to each side.

You could check the injector supply voltage. Since it's fed from the same relay, should be the same. If not, then possibly a bad wire/connection. The injector relay should be supplied directly from the battery. (Terminal 87) Terminal 30 to the injectors and others.
http://www.accel-dfi.com/pdf/GEN7_WiringDiagram.pdf

At the injector connector there are two power wires, check both. Also, if you really think 4 injectors drivers are bad on one side, flip the injector harness over and see if the problem moves to the other side.

Rob