you may want to try changing RPM for just one gear. For example, you may be able to run the 2-3 shift out a bit more than the 1-2 shift. Or it could be the opposite. It's not always that the engine wants to be shifted at the same RPM at every shift change.

This^^^
All modern transmission have "ratio progression" in which the RPM % drop on shift is widest on the 1-2, and closes up as you reach final drive.