Sorry to hear about your back injury.
Regarding the map, do you remember this map has 2.5 m contours? That may explain some of the apparent over-mapping.
Very aware that the map was 2.5m. All my comments were with that in mind. It's still overmapped.
Realize, of course, that the idea of only using features (for controls) that are very distinct in the terrain holds no matter what the contour interval is. And, just to be clear, "distinct" need not mean big.