The excessive roll, might be from the CG_Height in the sim file.
This is one of those variables that is a double edged sword. Too little and things are flat and the boat wont roll with the waves very much when surfaced. Too much and their over the top, and you end up, upside down.
As i recall, a good way to test this to see the varying effects of the number entered for CG_height, is to setup a single test mission where your surfaced, with a 20 or 30 knot destroyer bearing down on your broadsides, 500 meters away. They will ram, what your looking for, is how the boat rolls with the ramming per setting. Enter a large enough number for CG_height and the boat might do a 360. A small enough number, it might just roll over 90 degrees.
edit:
Another thing to check is the depth charges themselves.
There is a variable there that dictates the force of the explosion. (was it Impulse?). Basically this dictates how much of the depth charge you can feel, or how much it shakes you. Enter a large enougn number here, and you can actually propel the boat in speed or send it down in depth via the depth charge explosion. Back in SH3, i entered a ridiculously large number (200000 or something like that) for this varaiable, and a depth charge propelled my boat like 20 or 30 knots underwater, just from the exposion.
People like to jack this number up for the depth charge shake, but there is such a thing as too much of a good thing.
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