It was the Max depth value I just changed. I've just gone through all the sub CFG files and added 10 to each value I had previously, as before they were the same as the value I put in the ZON files.
I think the Crash depth value in the CFG file is the depth the sub will try to level out at if you order a crash dive. That's another test for later on though, I need a coffee.
Just uploaded a newer version with the revised CFG files. Get them here.
http://hosted.filefront.com/Meridian1a/