Sonar in Subcommand seawolf realistic?

[fastbikkel]

I love to operate the sonar manually, but im losing my interest already.
I know how to assign trackers and to determine which is the true target. (isolate the ambiguous sound)

What i dont understand, i can find targets from lets say 45km distance.
Against a full navy enemy fleet, i can find a max of 3 -5 targets, but when i put the auto crew on, it finds a whopping 10 targets and from greater distance.

When i return to the sonar waterfall display, select the towed or sphere array, i can only see a few traces. I have the top display on STA, the lower on ITA or even LTA. But nothing shows, apart from the few targets i already spotted.
Maybe im a n00b on this, but shouldn't i see the same targets as the auto crew?
I always believed a human could do it better than the AI.
But if the autocrew can find more targets from greater distance (without visible trace on the waterfall) then what is the use of doing i manually??

It realy is weird to me. To me it seems the game is limited in showing detailed sounds on the waterfall and right now i would love a more advanced sub sim.
Any ideas on this? Does sonar work better in Dangerous Waters maybe?