About how I can't get anywhere with all those planes buzzing me overhead! So I have edited my air files in the Silent Hunter 4 directory, in hopes of a few less air contacts. I'm pleased to say it's worked, but there are still air contacts. As far as I can tell, this is pretty realistic, since Japan did have air patrols looking for subs if I remember right. I don't want to mod my game to where there are NO planes, because that would just be very unreal.
Anyways, I've stalked some threads on the forums and the general tactic I notice is diving to at least periscope depth during the day. Now, I'm running two different american campaigns. One in 1942 based out of Freemantle in a Salmon Class sub. The second campaign is based out of Pearl in a Gar class sub also 1942. What I want to know is how does everyone manage to run their subs underwater until nightfall?
I've attempted this and usually end up surfacing to prevent my batteries from draining all the way to nothing...of course I'm running ahead standard while under. Is this my mistake?
Is the general concensus to run ahead slow, or to just shut down the engines and sit idly until the sunsets?
Thanks in advance, Captains....!

EDIT: I also happen to have a U-Boat campaign running. My first patrol was set to be in the Indian Ocean. I sunk around 23,000 tons of merchant shipping. (7 boats) I was shocked and figured my name would be first on the board considering in my American campaign I sunk around 7,000 tons and was 2nd on the board of aces. I was dead wrong. 23,000 tons of material earned me a 10th place in the German Aces. This is shocking for me...I sunk a lot of Australian merchants. Many sailors and countless dollars of material is somewhere on the bottom of the ocean and I hardly earned a pat on the back...
So, my question is this: Was the German U-Boat theatre (Atlantic/Indian Ocean) really just a huge turkey shoot? Of the 7 vessels I sank none were escorted. Time is 1942. Is this historically accurate? Or is this just a quirk of Silent Hunter 4?
Why is 23,000 tons worthless to the Germans and 7,000 tons is somewhat a decent rank for Americans?