Most of the issues aren’t actually exclusive to Daz, or make human or anything else that can help the workflow of modeling along.
That said, using a tessellation multiplier powered into a lerp that is managed by a texture as described above May (not necessarily, depends on the morph target too and how well it plays with tessellation) actually just solve your geometry driven issue.
The overall shadow, not so much, but I would bet on it looking better with a local multiplier of 8 or so.
Also, @FrankieV, the hair may be looking better overall, and I could possibly even use the new skylight parameters in the material, but it still lights up like a light bulb because of the irradiance parameters and something being wrong at the shader code level of the hair shader.
which, now that i think about it, it probably is something which can be adjusted exaclty within the shader model rather than attempt magic tricks within the material.
still, hair cards will outperform grooms for quite some time…