I guess you got your help, now its just reps and practice. When I learned the helo I just worked 1 system at a time and didnt even try to kill the sub. Its a big help if you have the manual open and take a few notes of what you did right and what you think you did wrong.
I had a tough time classifying subs with the bouys and learning the dipping sonar passive modes
With the helo I usually set the Mk46 torpedo to passive "snake" and drop a half mile from my last MAD hit at his stern matching his heading as best I can ( perhaps he will not hear the torpedo ) or at the bow from 1 mile active "snake" ( this way the Mk-42 avoids any counter measures and the sub has little time to react.
argggh