I play AOD from time to time. I did search the Net and never found any mods or utilities for AOD/CAOD. However, Subsim does have some tips on hex editting your save game file, but I don't think they will really up the difficulty level. I, myself, have mainly played in the early years, but I understand that it gets much harder by the end of the war. Maybe just start your career late in the war, hex edit to take an early model U-boat, and patrol off the coast of England. Perhaps, that will be the challenge you are looking for.
If you play SH1, there are a set of utilities which allow to pick your sub, crew level, and patrol maps.
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War games, not wars! --- Only a small few profit from war (that should not stand)!
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