Maybe try playing with the 'damping' 'spring strength' and 'gravity' factors under 'dynamics controls'. Increasing those first two should make poser think the hair is heavyer and maybe it'll wip around less? Not that I've tried it ;-) myself, that's the theory though.

"Your work is to keep cranking the flywheel that turns the gears that spin the belt in the engine of belief that keeps you and your desk in midair."

Annie Dillard