Do I need to go back to Torpedo school??

[fastfed]

Coming from GWX3 and back to SH4. TMO and RSRD installed..

I don't play manual targeting, not yet at least. But with SH3, I would get the targets location, Ask W/O for the identification of vessel, Check its draft and set my torps to about a meter or so below the draft, usually high speed..

I just set 10 fish at the Akita Maru, the draft says 24 feet.. Now I think its automatically set because sometimes I notice the depth setting for the torpedo is about that, when I lock on..

But in anycase, I tried 25-26-27 feet.. All three went under as if the draft was only "5" feet..

I assume contact influence is like magneto? In anycase I decided to try the next set of 5 torpedo's with contact and set for 5 feet.. ONE WENT UNDER THE KEEL!!

1 hit and bounced and the last of the 10 fish hit and split the ship in half..

I have to be doing SOMETHING wrong.. There is no way 10?? fish are needed right?

I'm a little lost