Only time I ever seem to get the blue bar to go away or move on it's own is when the gray one is gone. One torpedo, a few HE shells to the bridge to cut communications and then a few HE/AP to the waterline. I've gotten really good at hitting the propeller on the ships, make it so they've got no engine and you can finish at your leisure.
Helps in those large convoys with escort. Take out the prop on a few, hide and wait until the rest of the convoy moves on and pick off the stragglers.
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