I only use flank speed when I'm in the middle of a convoy when shooting, or at least one row of ships behind me, if outside, don't go to flank go to 4-5 kts max, unless there's an escort really really close (say within 1000 meters) then you have 2 options, stay slow and shallow, turn away 45 degrees and pray a lot, or go deep FAST because he's going to be on top of you anyway and dropping dcs so you want to dodge those, as soon as the first barrage has blown (and assuming you're not sinking by then) hard rudder port or starboard, set speed to 2 kts, and set rudder amidships as soon as you slow down to 2 kts, keep that course and speed (while still going deeper) unless the escort is not at least slightly behind you. If he's even slightly in front of you, try to figure out if he's heading towards you, if yes, turn into him, if no turn away, try to keep as many escorts in your 150 to 220 angle.
This works fairly well for me (have lost 3 boats to escorts so far in GWX, 2 because of my own stupidity (shallow water and maintaining flank speed to long) 1 because a type IX just doesn't really stand a chance against 3 black swans when earlier hull damage prevents you going below 120 meters) but have evaded succesfully after many more engagements, in all sorts of attacks on different groups of ships
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