The VII series subs have a fairly short Snorkel compared to the conning tower. You can hardly get the snorkel set just right without the conning tower being exposed in heavy sea waves.
The 'subname'.sim file contains the Snorkel height at 5 meters. You could change it to be longer to maybe 7 meters and see if it works in game, not tested though. It would let you go deeper.
Many times I sit at 12m same as periscope if calm enough waters. But in moderate 9 m/s waves it need to go up to 11 depth to make snorkel work.
That stock 10m will get you killed. The conning tower is exposed and the airplanes can see it as if on the surface.
So yes you could lower 1 meter, depends upon sea state. Eventually you will get a 'feel' for the correct depth.
Also, the 1 meter visual MinHeight hack does not make you invisible within 4 km of target, really bad at about 2 km. THis only makes snorkel not so huge at over 4km distance attracting airplanes like crazy. The CFG file shows that anything over half range gets double detect time. I am taking advatage of that fact to help make the snork hide at distance (It is under 2 meters high).
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