Last night, I took on a task force between Indonesia and Celebes in 1941 in water of similar depth, but I made sure to approach and attack from the flanks, not the front/inside :p Nailed two fleet carriers, and then snuck off at 130ft depth and 1-2 knots. A couple of DDs charged around and dropped some ash cans near me, but zero damage, and they quickly gave up and resumed course with the rest of the task force.
I'd suggest trying to creep away. Stay as deep as possible, silent running, and speed absolutely no more then 2 knots. All those ships above you are going to make it hard for the escort's sensors to pick you up, as well as constricting their way to search for you.
It's also been my experience that the escorts will usually not hang around looking for you too long if they don't make quick contact. They tend to not let the task force get too far ahead of them before they rejoin it.
Just sitting on the bottom seems usually a recipe for death, in my experience. You are certainly not hidden from active sonar there, so if they ping you, you are toast. Move, slowly, but move, and glue your ears to that hydrophone.
P.S. this was in the USS Saury, my new career's first command, originally out of Manila, but we can't go home there now
