Did someone utter my name? :p
While working on my mod, I also noticed that the draughts in the .sim file often did not match with the draughts listed in the Recognition manual. Actually, the _en files control the text output in the
museum files, not the RM. It's the .cfg file in the data/Sea/ folder that you need to change to match the .sim file. I've already done this for all of the merchants in my personal installation of SH3. However, my STzSinkingShipFix mod only adjusts the .cfg files to match the changed .sim files of the ships in my mod.
I can upload a copy of my data/Sea folder with the matched .sim and .cfg files if you wish, but I can't guarantee that it won't make some unexpected changes to things like the ship's wake, as Privateer noted. So, be sure to make a backup first!!