Yes, you need to add the new MFM ships to EnglishNames.cfg with a display name for each, if you haven't already.
If you use a list I posted upthread, doublecheck it, I've reworked mine several times since then and found some duplicates - not sure if they were there when I posted it before or came later when I was tinkering. But you should have a line in EnglishNames.cfg for each ship that has a folder in data\Sea.
You've got plenty of RAM, are you running a 64-bit OS or 32-bit?
Either way, get the 4GB patch for the game .exe if you don't have it already. It will let the game use way more of your available RAM than it can without the patch.
