While I understand the urge to draw useful connections between body weight and pack weight I'm not sure it can be charted on a simple X-Y grid as you've attempted to do there.

I know you are only trying to paint in broad strokes, by suggesting what sort of pack weight could be considered heavy or light for individuals of varying weights, but by reducing your chart to a grid against two variables I think it takes the simple reality which everyone will understand without your chart, that a heavier pack is more work and less enjoyable to carry, and anchors that truth to specific body weights in ways that don't add much real information to that simple concept, while possibly misleading people in the process.