Now I see where the confusion is. Lets see if we can get on the same page. I have a Norcold N611V so we are talking about the same unit. The thermistor is located on fin #10 from the right. This is the fixed setting. If your fridge is too cold, you move the thermistor down. This puts the thermistor in a colder section which causes the unit to turn off sooner thereby making the fridge warmer. Moving the thermistor up puts it in a warmer section (hot air rises) and causes the fridge to run longer.
That is the normal process for adjusting the fridge temp.
Now comes what you are reading and why. If your thermistor is not within the fixed setting range, the manual is telling you to relocate the thermistor from the fixed setting as you described. This is a work around for a slightly out of whack thermistor.
So my suggestion is to try the bottom of fin #10. If that does not work then relocate the thermistor to the right but still at the bottom of its new fin location. If you cannot get it warm enough then it is likely you need a new thermistor.
You can test the thermistor by following the lnfo in the link I already posted.
My fridge was too cold and I was able to get it to 38-40 degrees by lowering the thermistor. YMMV
Ducky Sez; My posts are intended to help with technical and maintenance issues for F/SS only*. I do not measure skin thickness and nice is just another four letter word.