Ive done plenty of tests in late 43 and 44 scenarios.
I have found that tweaking the sim.cfg and even with noise levels at 0.40, I can still sneak away from a Hunter-Killer group in summer 1944, when I dive deep: >225m and go to silent running.
I have a >90% survival rate.
I am using RuB 1.45, which I assume has the requisite changes to AI sensors ect.....