Ok, now I'm totally hosed. I tried converting the data connection to a UDCX file that connects to a secure store service I established for GetUserInfo, GetMyInfo, and GetManagerAlias, and while it works, it still submits with a System Account username in the Modified By column. So, I went back to a full trust form using SubmitAsUser in qRules. published the form, uploaded and activated to the site collection, changed the libraries to use the content type, and mapped the path to the form in DAT. Now I get this error:
A form template (.xsn) file cannot be accessed. You may not have the required permissions to open the file.
What am I missing?