SOI EOI makes 0 difference on MPI system at WOT.
In fact, even sequential injection makes 0 difference, you could even have mono injection.
DI is a different story, but for MPI, as long as injector is big enough, it will not change anything.
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.