CPorter, I think your tag line says a lot about this.

"I find it always necessary to stress that we cannot equate brilliance with contrast."
---AA (The Print)

".....in printing we are trying to breathe expressive life into the image,.....this raises intangible issues that do not yield to formulas or measurement."
---AA (The Print)
I have tried moving just one direction and it does help in certain situations.

Part of what I'm getting at here is that the brightness where a subject (say a face) looks best, it's placement on the paper curve, can change depending on the contrast and the scene.

With a softer paper grade I find I can print mid tones and shadows darker in general. This is far from a rule though.