Usually I want to dive about 3000-5000 yards to the flank of the coming TF if I plan to pull the escorts away. Much harder to do with cams off, so I'll try to get a good track and mark my attack position. More often than not unless water is way rough, I'll pull the escorts out by letting them get me with radar or even chance a visual if needed. Sometime I even have to ping the group a few times, but that works even better giving me range. That's why you need to mark where you dive, because that's where the escorts will be searching, plus a mark where you hope to attack from. You want to pull the escorts away as far from the group as you can, if they come a running from 10nms, that's great, dive and haul arse to your attack point. If you wait too long the TF may go by.
The main thing is when you dive to haul arse and escape the circle the escorts will be searching. Usually I'll atleast go past the thermal layer. If sonar tells me they're still at my dive mark I know I can come up to scope depth, but you have to time it where you can reach your attack point, but the TF will go into zigs and slow down giving you more time. If you're being pinged, you didn't get far enough away from the hunters...then it's a chance.
If not doing this I try to set myself 1000 yards to the flank of the lead escort and come straight at that mark, helming my bow slowly towards him. I will try to get speed and course with stad and lock on so I'll have some clue before I get too close. Usually you know when you're close. Main thing is to listen with sonar for that lead escort to pass, that's time to come up and shoot. Hopefully the lead escort will be gone anyway searching your dive spot.
Again, any fixed attack method that holds you to a course is dangerous. Nothing against all the OKane type attacks, they have a place, but if your goal becomes to stay on a fixed course, you're gonna get pinged by the flank escort.
Obvious when you come up ships will be zigging different speeds, so it's picking targets and two good stad points then easy aob for course and speed, then unlock and shoot by the wire. I'll shoot all torps and dive and head flank so I can again leave where the escorts will come hunting.
Obvious if I'm using cams I can just steer with the cam and watch everything, which is rather easy, but I play both ways depending on time, but still use same tactics.
Here is my attack with the Yamato where I had to do 3 end arounds, you can sort of get the idea. At least twice when I attacked the Yamato a few escorts were way off searching where I dived off the flank. You can basically see how I stad and shoot by the wire, which I think you understand being a fan of ez aob, in fact I think you turned me on to it.
http://www.subsim.com/radioroom/showthread.php?t=175983