I'm sure a lot of this is old hat for most here. Checking normals forward can help a lot with hair. The P8 Alyson and Anime hair textures have been working well for me combined with the normal transmap for the hair.

This is Koz's Classic Ponytail combined with Tequila hair using the standard Alysongold texture. I think it looks pretty good.
To use two prop hair on the same figure, load the first one, open Hierarchy Editor and move the hair parent to universe, load the second one, then parent the first one to the second one. You might want to lock both hair props if you plan to apply any pose files in order to keep them in place.