The record length used is exactly as specified in the FD. The first byte of a record is used for the ASA character and, as per the mainframe, the last byte of a record may be lost, since the record contents are shifted one byte up to provide space for the ASA character.
You no longer need to specify the options MAINFRAMEPRINT=ON or FILETYPE(11) as they are turned on for the Report Writer file by HOSTRW.