If you had to use xyz translations to get it to fit correctly, your best bet would be to fit it to the figure you want to parent it to (make sure that figure is in the zero position), export the hair prop as an obj. Don't check anything except the existing groups option (last in the list on export). Delete your scaled hair and import the object that you just exported back in. It will be in the correct place and the correct scaling. Parent to your new figure's head and use the materials from the original hair. Save to your library (don't select any subsets when you save) - it should say something about the item being a smart prop and do you want it smart propped...choose yes. You will of course lose all the morphs for the hair this way if there are any.

Laurie