Ian this is sample email that you could consider to send along with the attachments we've created.

Dear Carol,
Thank you for the recent phone conference. After our discussion I reviewed many details related to assets and shared financial responsibilities. As you can see from the attached documents, I have made many concessions in order to demonstrate goodwill and expedite the process. Notably, as we discussed I decided not to include any claimed responsibility for the mortgage even though a fair share of that would've been $10,000 but as noted is taken off the table as well as a number of other minor expenses. Some of the expenses were offset by E. Herrman's modest support. You will see on the attachments a general cover letter discussing the assets and financials overall; additionally, a separate detailed description of the tax assessment with my calculated responsibility, assisted by the tax CPA; and lastly a detailed spreadsheet with additional comments.

I believe my proposed settlement terms are very generous and reasonable and should expedite closure of the matter. I appreciate your review and any input.