Question on higher rpm gains

My combo's have not been at the level of power that you are making. I have played many shift point games and I've always seen there is a sweet spot where +/- 200 rpms doesn't change the MPH or ET. I always shift at the lowest RPM that still makes the best ET. In other words, if 5600 will run the same ET/MPH as 5800, I'm shifting at 5600.