I-765 congress expedite Documents

I have a question and would really appreciate your guidance. I am planning to request congressional support to expedite my I-765 based on my pending AOS application. My concern is regarding the supporting documents: should I include my residency contract, or would the support letter from my hiring manager/program be sufficient?

I am currently working in cancer research and will soon start a medical residency position where I will still be involved in research activities. However, since my NIW was approved based on my research work, I am concerned that USCIS could misinterpret the residency contract as a shift away from my approved NIW endeavor. Because of that, I am wondering whether it is safer to rely mainly on the support letter rather than submitting the full contract.