As i recall, there's more to getting the IXD2 to riding in the water correctly than just the draft. You also have to edit the XYZ coordinates of the root node a little bit within the sub's dat file itself. It sits 0,0,0 as i recall. Take the XYZ coordinates of the root node in one of the american subs, and take those coordinates and apply it to the IXD2. I seem to recall the uboat rolling and wallowing a bit better in the waves after doing this.
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