Well number 3 in my experience the Japanese RWR is far less than the max SJ range.The last time I experimented they clearly had me pegged at around 10~12 miles sometimes less might be different in TMO 2.5 with changes and what not but I imagine it is still not near as far as the SJs max range.It seems that some AC have very good either RWR or their own radar so late war if you get an RWR hit you had better dive if it seems to be an AC. I have never had the issue you mention with radar.You might have been near a carrier TF in which case you will have encountered alot more aircraft than you would normally seem to it may have seemed like they where seeing your radar they may not have been at all depends on the year once the RWR for the sub is available you know that some IJN stuff has radar if it was pre late 43 then they generally have no RWR.
Number 2 I have not tried in TMO 2.5 but I am pretty sure that it has been said in the past that the ability for the AI to "hear" pings is 0 and that this is hard coded.So you can ping all day long they will never hear it.If they are coming after you they have you pegged in some other manner.
Attacks using just sonar all seem to have failed but they did sometimes use a ping for ranging although most crews found the SJ to be the most effective way to estimate range the real thing could actually see the splashes of deck gun shells as well as sometimes pick up low flying aircraft.Later war they also had special sonar that detected mines this sonar is not in the game.
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