When does an injector turn on? What tells is to? The reluctor wheel? Cam pickup sensor?
Ideally an injector should fire when the valve is opening. Is there any way to control the turn-on point in reference to degrees camshaft rotation or calculated valve opening?
Adjusting the injector offset is purely a compensation for injector current saturation plus other mechannics. It is not a timebase past or before top dead centre.