I tried the mod and in heavy waves the Sub seems to be too stiff. 12 meters high waves should wake it more IMO.
By any chance is it possible to add randomly rogue waves? Could be a very nice addition in terms of realism and be some sort of "easter egg" also.
Rogue waves? Here :
http://en.wikipedia.org/wiki/Rogue_wave
and
and for those who understand french, here's a very serious documentary :
http://ma-tvideo.france3.fr/video/iLyROoaft1sH.html