Vroid race hairs could use some adjustments, at least with some of the pony tail hairs. a lot of them are unavoidable from clipping.

Unfortunately, when it comes to certain hair styles clipping more than others, there is little I can do since I do not own either models and only allowed for the functionality of certain hats. The list of hats that I chose to give this functionality to is based on the list from the "Free the Hair" mod and some of the most obvious choices like the mercenary face mask, which doesn't cover the top of the head at all. The only solution I could see to these issues given the limitations of Kenshi would be to add custom hats that utilize the assets from hair mods and Cat's hats and make each hat sit on top of each hair model based on causing the least amount of clipping. However, I'm afraid this is something I cannot even attempt to make since I know nothing about blender or any other model editing/creating software. The best suggestion I have is to either avoid certain hats that cause lots of clipping, or use hairstyles that don't interfere with hats too much. However, I cannot guarantee that doing so will stop all instances of clipping. Quite a few mods I have add very tall hairstyles which shoot straight though the top of many hats, and as a result I try my best to avoid using such hairstyles. Sorry for such a late response and the inability to implement the solution of thought up. the best you could do is go to Cat and ask if he would be able to test such a model to see if it's even possible.