Then, no offense intended, either the nut wasn´t cut properly, or the locking nut was not installed at the correct angle.
I´ve had all sorts of problems with Kahlers over the past 30 years, as unlike Floyds if you don´t maintain them somewhat regularly, they absolutely will eventually sieze up on you and cause all sorts of issues. But the one issue I´ve never personally experienced is binding at the nut, not to toot my own horn but "probably" because I always cut my own and know exactly what I´m doing and why.
But for live use I generally still gravitate towards Floyd equipped guitars just because it´s just one variable less to worry about. :friday: