The pinch test (as far as I've seen) is done more to set high speed needle.

I'm not saying it won't work for the low end, apparently it does. I've just never come across anyone doing the low end in this manor. ( most of my flying has been done with the same old farts for 18 years or so. Perhaps my exposure to other methods has been limited.

As far as setting the low end, I have no problem setting it by the way it takes a rapid throttle advance. and the way it idles back down.

1,001 ways to do everything I guess. Find what works for you and run with it.