Ok - in the K5ii menu on 3rd page of 'camera' folder there is the slow shutter NR selection and I can select auto/ on/ off. It seems you might not have the always 'on' selection. If I select ON, then it always takes a double shot, the second being the nr (or dark field subtraction) shot, and the time = that of the first shutter time. And works on RAW files. So you would have noticed that, even though the processing time of K-3 is quicker!

As your shots seem soft, it maybe something else, as assuming everything is stable, the NR simply subtracts any pixels that are bright when they should be dark.
The high ISO nr is something that can make an image soft.

If its like some of the other cameras, I suspect that NR only kicks in with a shutter time of greater than 30 seconds - ie try using B mode and, say, 40 seconds with NR activated

I don't have a K-3, but slow shutter speed NR, AFAIK, means that any long exposure will be followed by another exposure of the same time. Ie the camera would be unusable for that extra duration as the sensor records a dark image that it then subtracts form the picture exposure. You would certainly notice whether the camera was doing that!

No 4 does look good as you intended with blurred hand. No 2 works well for me, inspite of the colour cast, as the singer is immersed in what he is doing.
Out of interest, what is the instrument that the guy in front is playing?

This may be the official advice, but it didn't work very well for me. When my 17-70 DA went faulty, it told the camera the mid-range setting no matter what the zoom was set to. The SR was only effective when the zoom was set to near that point. Near either extreme, whilst it probably reduced some shake, it didn't do a very good job of it

Impressive work!

There al great but no 4 is my favourite. And they do look better with the WB reset

Would love to come - but Brighton to Tickhill too far! Also I work on a Sunday!

yes - I had quick go at the old map and gave up

Interesting - never tried it, but as swarf says can see the advantages. I too shall give it a go!