We did testing on another platform for MPI - had hands on Injector Dynamic few offers - and power wise there was no noticeable difference between injector sets with 50% flow difference. There was downside with bigger injectors around flow mismatch on low power area - but that was minor. Where SOI-EOI window reserve may have value with bigger flow is to avoid lean run on power spike peaks - but that is rare case to happen(money shift thingy ad similar)

SOI-EOI makes difference for lower CC followed by lean run if unlucky or ecu too slow. For power band - yes MPI has no impact there unless mentioned previously.