Well............
Maybe you need to change your mindset and your tactics will follow.
I really like TMO. It's a gas. With that being said.............
I assume that I will be detected. I expect to be detected once I attack. I usually can get by a screen. If I'm detected before I reach firing position; I just drive right on in and wreak havoc. Anywhere from a standard to flank bell. Many depth and course changes. You need to know your enemies detection capabilities............Don't sit around waiting for the cans and hope they don't knock you on the head. They will.
I try to be outside anyones detection arc by about 1000 yards..... minimal facing aspect. Deep.
From range you need to analyze the formation and the escort patterns.
From there I usually draw a line indicating the formations overall course.... (I'm thinking LARGE formations right now...just scale down as neeeded..)
Then I look at the disposition of escorts and their sweep pattern.
They all usually cover a certain amount of frontage. I look for the "thin" points where they overlap and that's where I penetrate the screen.
The buggers might get right on you....but they don't necessarily got you. You need to be able to recognize when they're just dropping versus making a dead on run over your head and unloading. Don't let them spoof you into evasive maneuvers unecessarily.
Anyhow.........the mindset change you need to make is thus; you state (paraphrased) "I was deep, silent and slow....but they heard me!!!!"
As if you shouldn't have been.
The point is...assume that you will be detected and fight as such. Be the aggressor. Screw conserving your fish. I shot 4 at a minesweeper last patrol. 3 missed, when the 4th got him.....it was a hoot, blew him out of the water......broke him in half, blew the forward section into the air and it spun upside down and then crashed into the water.
Less then a 1000 tons but the visual was certainly worth it.
Regarding evasion............
You need to pick your axis of escape and maneuver around that. It's usually the opposite direction of the formation. Change depth a lot. you don't need to necessarily maneuver drastically. All it takes is a chess like mindset. Think in terms of boat lengths.
I wish I could be more concise about my play style; a great part of it is using the hydrophones and imagining what they're doing on the surface and maneuvering ahead of the game.
A big part of it is knowing when the heat is really on and driving to periscope and fighting the boat. Down the throat shots. A whole nest of fish. Don't even think about torpedo conservation. Think boat conservation.
Oh yeah....go find Bungo Pete. He'll teach you a lot about evasion.
Have fun....