(1)The most dangerous DD is the Akizuki... with a gun armament matching that of a small cruiser there is no way engaging it surfaced... and when submerged it has 2 DC-racks and 4 K-guns to send you to the ground... but all this counts nothing with a novice-crew... then they are easy... they don't detect you and they do not throw so many DCs... an elite-crew on such e ship is almost always deadly for you... they fire all K-guns and release about 16 DCs from the rack... and there is very little chance to survive a well place attack from those...
(2) like switch said
(3) any sub can use MK10, but the S-class can only use MK10 torps.
(4) like switch said
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