GWX removes the hull integrity indicator by default. You can restore it either through SH3 Commander or editing the en_menu.txt file (Change the 589= line to 589=HULL INTEGRITY %s %)
GWX adds positive buoyancy to the u-boat at low speeds. The lower the speed the greater the effect. Near the surface its a matter of a couple of meters. At 0 or 1 knots you will rise about 3 meters above the depth you've set (which is why at the default periscope depth your conning tower pops out of the water). At 2 knots, you will rise about 2 meters and at 3 knots maybe a meter or less. You have to manually set your depth lower than what you actually want. Above 3 knots its not a problem.
At lower depths however, the depth you will actually be at, versus the depth you set, can be 20 or 30 meters (even more). If you don't like this there are a couple of neutral buoyancy mods around (as danurve and robbo180265 have already pointed out). Note that these can effect other things like the boats behavior on the surface as well.
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