IMO 1944 on XXI it is not hard.
You simply have to periscope depth dive in dock.
There are unfortunately a few bugs in the type XXI (in GWX, too) as the radar antenna or sometimes RWR broken. Also changed are the front and rear batteries when they are damaged. Also in contrast to types VII and IX, RWR appears on the snorkel not 1 October 1944, but 1 January 1945. A little weird.
But despite that swimming at XXI is very easy. Submerged with silent-run to overtake the slow convoy, and then load the torpedo while shooting. Recently, when I tested the patches for a type XXI I was able to sink almost all ships of average convoy and two other destroyers escorted by torpedo T5.
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