Remote Force is a tool to leave out some of the structure to save solution time.  It connects to the remaining structure in a way that is not identical to the missing part. If the highest stress is at the point where the remote force connects, and you want an accurate stress result, then you can't use a remote force. Put more of the structure in the model until the highest stress is where solid elements are present, and the face used to connect to the remote force has a lower stress.