"Correcting" the rocker geometry is a nice idea (and not significant with small errors).
The real argument is not to correct them, but what is correct?
Depends on what you're trying to do.
1. reduce the side thrust vector
2. create the largest "window area under the curve" of valve curtain area
3. move the window closer to a specific point of valve lift
4. move the window closer to a specific point of engine vacuum
5. achieve "mid lift", in which the stem is at 90 degrees to a line through the shaft and roller axle centers @ 50% lift

No, all of these cannot occur simultaneously.