Also, trying to "keep up" submerged is somewhere between insane and suicidal!
If destroyers can see you well on the surface, then they can hear you even better when you're doing 9kt underwater. I wouldn't even try that.
The rule is, once a sub is underwater, it's only slightly more mobile than the average mine. So you need to get in position on the surface. Generally the best way is just trying to predict where the convoy will be in x number of hours based on their speed and heading, and head for that spot at top speed while laying out a course that keeps you away from that convoy. Adjust as many times as needed.
I don't find it hard to keep out of sight of destroyers. I'm much more challenged by keeping off their sonar, actually. Which is why I've sharpened my surface tactics and don't dive until it's absolutely neccesary (and with experience, you usually get a good feel for when that time is).
Battling destroyers is absolutely pointless unless you're caught with no other escape. It's a lot easier to get them in SH4 (and III) than in real life, unrealistically so, but really the point is - your sub is always safer when you go deeper. You stand a much better chance of losing them in the long run. And once a convoy is alerted, it will be trying to evade you anyway. Best to retreat, reorganize and try to surprise them again later than trying to chase them while they're purposely trying to dodge you.
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