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Sounds like a point I was getting myself too consistently after some practice.

Re-inspect the bevel look for any differences,

What I did at that point and still do at times is run 5 or so...

I started cold as you put it my self. I did all of my light bevel work on my 5k so I would learn to feel the change.
Many times I would get to the shave test and take it back down to the 5k after...

In a seperate thread someone (and fogive me I don't remember who it was or which thread it was in at the moment) picking some DE blades.
This will give you a base line for the TPT and TNT, just...

How does the bevel look?

Did you try the TNT or the TPT at the 4k as you were usuing it to set the bevel, did you inspect it with a loupe, and or strong light.

Was it poping arm hair off the...