>>386864747
And having the root bone will basically solve the issue of too many physbones for the hair. It'll still give you lots of physbone transforms, but the limit for that is rather generous (64 for good, 128 for med) vs the individual physbone component count which are 8 and 16 respectively. It also saves you time having to set them up individually.
Don't use CATS to export if you are.
The standard blender export works well as long as you do it right.
Select Armature and Mesh only, set scale to FBX ALL, and disable leaf bones while you export. Works well every time.