On any DBW/ETC ECU you also need to remap the Accel/Throttle table. For instance, my factory ECU has the throttle plate close down to 20% at 7000rpm. This is independent of the soft injector cut.
Here's a remap for a 7250rpm red line. I increased the rev limit values from 7000/6900 to 7250/7150, and also remapped the main DBW/ETC table.