1: Don't know for sure, but could it be a lack of manpower in the torpedo rooms. Are they too tired perhaps. Anyway, in the conning tower should be a switch panel with which you can open the doors also.
2: It's probably the curvature of the hull. Impact torpedoes work best when they hit a vertical section of the hull with their front. Set the depth a little higher so they avoid the curved section. But in heavy waves this may not be possible to be avoided. Ships move up an down on the waves so it's just a matter of being lucky.
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