Torpedoes Los!

[Chad]

I'm trying to teach myself manual targeting and I have watched Neal's YouTube video and I have read Capt-Maxim's guide to targeting, but I still can't even hit the broadside of a slow moving ship in the Build 144 alpha. I'm getting close but it looks like even though my aim is off (usually in front of the ship) the torpedoes are exploding. Could this be the torpedo run and it explodes at the distance the ship should be?

I've been repeating the steps like a mad scientist and mixing up the values entered a bit each time.

1. Full ahead surfaced, compass heading 90 degrees
2. Getting to 10k meters, submerge and stalk prey until about 2k meters
3. Ensure the value for AOB is as close to accurate as I can, this ship I believe is heading ALMOST due north, so AOB set to 270
4. Line the front of my bow up with the ship 5-10 degrees starboard
5. Set my Target Angle at 4 starboard
6. Triple check distance on last time and modify if needed
7. Fire Torpedo 1
8. Adjust Target Angle 2 degrees more starboard not touching periscope
9. Fire 2
10. Move Target Angle a hair more starboard
11. Fire 3
12. Move Target Angle to 2 degrees, Fire 4

I see them all explode in front of the ship or right broadside but maybe short of actually reaching the ship, and it keeps sailing while I restart the game to try again.

What am I doing wrong??