Exersice: do the Five Whys brainstorm
Organize a brainstorm session with an outsider representative to the panel. Let the other ask you the five why questions and their sub-questions. Instruct them to only accept answers they can reproduce and find convincing. If they give you their summary of what you told them, they will have to rephrase it in their words. Write down the lines that work for them.
During the strategy and USPs session we will also help you with this.