Of course I hope you understand that your W is likely being "coached" by the L, or the L is being aggressive for the benefit of the client.
If your L let you know that your W is probably going to go for full custody, child support, spousal support, 50% of the assets + an additional 10% for emotional harm, plus your pension plus her L fees... do you think that you would not get excited to go for full custody, a cash buyout of your W.
It's the nature of the "beast" preying on our fears. It's their job and how the system works and many people buy into it. They (the clients) are human. And by moving swiftly, it's easy to keep an already off balance opponent in the defense. What you and your L can do is ensure due diligence and take as much time as alloted to ensure everything is considered. It may cost a little more for that service, but what is more important? Saving money or ensuring a fair split?
I am glad to know you are still going to try to write the letter. Again, let us know when you have it completed or have any further questions about it.