THE PROBLEM –> HTTP 400 Bad Request (The data is invalid)
Xaf provides peristent of your web listview setting to cookies using Options | SaveListViewStateInCookies attribute in the Application Model. But due to the limit in request buffer size of IIS your web browser will receive a HTTP 400 Bad Request (The data is invalid) when you overcome it.
DevExrpess suggest you either persist individual listviews in order you never overcome that limit or as Microsoft also suggested here to add a registry value to raize that limit.
ModelDifference module provides the Options | SaveListViewStateInDataStore that can persist your listview settings to your user model and thus to the database and since your model is persistent also at database