Here are a few answers:
1. I try not to overtake ships that are heading away from me. Keep an eye on the reported contacts (coming over the radio) and try to intercept inbound targets (heading towards you) only. This will give you time to get into position. Surface search radar (once it becomes available), really helps in this regard.
2. Traveling at 9 knots underwater is bad for two reasons. First, it drains your battery in no time (when you play with the limited battery option). Second, it makes a ton of noise, which will make it much easier for enemy warships to track you down. In an emergency, flank speed is OK. But I try to avoid it as much as possible. I spend most of my time underwater at ahead 1/3 (or slower) to conserve as much battery as possible.
3. If the damage to your diesel engines is '1' (hover over the red bar in that compartment to check), you have to return to base to get it fixed. In other words, it's completely destroyed and you can't make repairs at sea. You'll definitely want to prevent this kind of damage if at all possible.
4. I'm assuming here that you have moved people from one department to the repair crew. If you did that, you have to manually move them back to their previous locations (there's no way to do it automatically). One way to get around this is to get some new sailors when you're in port to be a dedicated repair crew (three or four guys is sufficient, in my experience).
5. I think you must be talking about the "follow nearest contact" button on the sonar tab. I don't use this, so I can't offer much advice, but I think it might be only used to keep track of the bearing and range of the nearest contact (for manual targeting reasons).
Hope this helps!
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