Hi Bill,
I found just what you needed.  This is the DFS vs USM video which I know you have mastered, but others might be seeing it for the first time.
https://www.youtube.com/embed/AiVoXcB1uzk

The next one is the Tone Targeted video     https://www.youtube.com/embed/xn7Ipw8IAhQ
This is the one you need. 
One point I need to touch on and that is the slider.  When using any Tone Targeted tool that slider goes to 100% Meaning it has narrowed the threshold of of the tone to close to what you clicked on. Trying to explain better..... Let's say you selected "do not sharpen the blue sky" Many times a good idea as vast expanses of one color can contain noise. But you said Don't sharpen blue sky. The slider is 100% right side.
Perhaps that gal you took out for lunch has blue dress that could you a tad of sharpening. Just move that slider to the left to perhaps 85%. You have told QU OK to expand the tone to include more shades of blue.
Hard to explain without a face to face.  You have to try it and see how obvious it becomes.
OK post back to us if I wasn't clear enough
Fred

Sure Bill,
You are right about the 3/250 because if you were doing regular EQ sharpening, those numbers would likely be too strong,
Reason.............the slider is all the way left, to zero %.
When you use Tone targeted tools, the slider jumps to the right, 100% (contained/controlled/Selective.)When  you use the RGB selection, you probably wont see any sharpening until  that slider is 85%.
You can even sharpen nuances of color using RGB
Fred

Right on the button. Each image is unique and subjectively evaluated. I find, for example,  that on scenery type images a 6/45 is excellent.
When you  first try Tone targeted, you have a tendency to over do it.
Play, experiment, trial and retry. Perhaps the least used tool is the A/B button which allows you to see if you made it better or worse.
Fred