If the chipbreaker does not adhere to iron....

Is ......
likely that the thin chip is stopped between the two irons with
resulting plane mouth clogging. It is therefore necessary to carefully flatten the surface portion  of the chipbreaker that 
adheres to the blade and ensure a perfect fit between the parties. The problem is that sometimes (if not frequently) the chipbreaker is not regular and after the iron screw has been tight the
blade may show non contact areas, despite having flattened with
care.  Being soft iron, we can try to straighten the chipbreaker in the vice but this is a little difficult job. 
Another method is to create a burr on the chipbreaker edge, by which we can close any (small) residual gap. The procedure
plans to keep the chipbreaker with an angle respect to a flat surface on which we attack a sheet of 150 grit abrasive paper. Move repeatedly backwards until the metal burr forms. So
use a small screwdriver (electrician models have
the right thin measure) and pass it along the contact line between the two iron until they adhere perfectly.
The process takes few minutes!