I inherited a couple of old hens from my neighbor. Both have their beaks cut back and poorly done at that !! One's is too short and is like a short duck bill in that it is rounded which makes it hard for her to peck. The other is even worse because the bottom is not cut and sticks out way beyond the top so she too has trouble eating. I can't do anything about the short round one but can I cut (carefully) the long lower one back ?
*I* would just leave them be. Their beaks have already been subjected to the brutality of being cut, they probably shouldn't be cut more. Most folks with de-beaked chickens feed them from a deep dish instead or the normal shallow feeders. I guess the idea is they can more scoop instead of peck. Good luck, and again !
I have a rooster who broke his top beak off twice. It now no longer grows. I watch him and only trim the lower if he seems to have trouble eating. I hate doing it...it usually bleeds. I try to keep his food deep in the bowl so he can grab it easier.