Yeah, keep the strong wording out is best for now.
I gave my W a bunch of letters. She never much commented on them at the time. Now after the divorce is almost final, she tells me that she reads them (and a big photo collage album of us) a lot. She has huge regrets for what she calls "the nightmare that came into her life". But her pride has kept her from ever saying she wants to do what was required to come back - regain my trust.
I only hope that your W wakes up to and realizes what a marriage with Jeff can be if both of you work towards a common goal of creating a fullfilling relationship.
Dont ask her if she read or what she thinks of the letter. Let her be the one to initiate a response. There is hope.
