okay, dig this: allright, here's the deal. I've got this Ary German bow. First re-hair after a year was great. Second one was salt-n-pepper. Not too impressed; the hair gripped poorly. went to a different luthier for the third re-hair, white hair. Again, not too impressed. With the second and third re-hairs, I found that there was a certain "dead zone" somewhere around the first half of the bow, where the strings just wouldn't grip. Could this be my playing, or the way I apply rosin? I apply rosin in the standard method, from frog to tip. Help would be appreciated.