A bit late, but: Don’t move your problem, eliminate it. Deformalise your test process. Move your rigid, explicit test cases into checklists, scenarios or charters. Only formalise very important requirements (like very specific safety requirements or certification requirements) whilst staying as vague as you can. This is faster, more flexible, more powerful (less formality means looking in more areas in different ways for more hidden problems), more scalable and your testers will be more engaged with it.