I don’t remember where I read it, but there was a nice discussion on setting the springs up near coil bind.
Someone who was part of that discussion had a pretty elaborate computer supported spring tester.
He referred to the springs having a “soft bind” and “hard bind” height.
Hard bind is the “solid” height.
Soft bind is when the coils start touching and the rate starts to spike up.

I started looking at that situation more closely when I was setting up springs where all or most of the available range/travel was needed.
What I found was, fairly often there will be couple of springs in the set that for one reason or another the coils start touching at a taller point than the others, and those springs can have the pressure spike up a bit when compared to the others.
Not to mention that they may actually have a slightly taller solid height, compared to the others, and to the coil bind spec.

So, now I try and shoot for the “soft bind” height(when possible) as the point the spring will be at when the valve is at net full lift.