Thread: Why does razor pulls and scratches my face despite HHT passed ?

Sounds like microchips... You have been touching-up the razor a few times over the months, but as said before, over time touching up may not be enough to correct (or remove) microchips that slowly develop on the edge with normal use.

Maybe you have a Norton 4/8K or a single grit 8K, so you could do a few laps with the 4K with water or a few laps on the 8K with slurry... not quite "bevel setting" slurry in the 8K cuts faster enough to smooth out those small chips.

The HHT is a reliable test, but only good if you are sure the entire edge is the same sharpness because the "hanging hair" is only cut by one tiny spot on the edge... so what about the rest of the edge.

Also as suggested in previous posts, you may need to get acquainted with the other two tests... TNT and the TPT.