UE 5.1 Issues with Grooms | Quality downgrade

After implementing all the rendersettings from a blank project .ini, UE forces me to revert them to the original since they are required by the MH.

For me, thin hairs are only visible as artifacts when being very close to the MH. (See below)
When I increase the Hair with or the scale at the root or tip, its overall visible but looks very ugly. Is something like a minimum object size to be displayed which differs from UE5 to 5.1?