As well as the startup.cfg edit you must also point to the RoF/data folder in the PW-CG configuration menu under "Automatic Mission Results Directory"
Be aware though that any other missions flown eg using QMB will also generate txt files in the RoF\data folder. Pat's generator deletes the files it uses when its finished with them but other files are left in place so a manual delete may be necessary to keep things tidy.