You see that they've lost their sharp wit and edginess, but you've long come to terms with that.
Embracing that edginess, then, as she seems to be doing, would be key.
It managed to walk the tightrope of edginess and heart without wobbling too nerve-rackingly in either direction.
Every one would know that the clean and clever little story was her own and the edginess his.
This also should so break up the edges as to get rid of any feeling of squareness or edginess.
Don't be afraid of over-exactness, nor of hardness and edginess here.