I experimented with something today.

I took the same print but one that was printed a little lighter (overall exposure was a little less), cut it up into pieces and selenium toned it to different degrees.

The end result was that highlight part stayed the same or slightly increased and Dmax increased - visibly on the one I toned for 8 minutes. Which made the light print darker and contrast higher perhaps by about 1/4 grade worth. That part now looks brighter although the max density is the same as the original print. I can also see more detail in the shadow area because of this increased contrast.

The changes are rather subtle but I see a clear change.... if that makes any sense.

My next step is to reprint this, tone it, and see how it will actually work on overall image.