The only advice I can give as I am still in progress like you.. Is its ok to make another go at it..
For example.. After all my planning of intercepting, I would be way off.. at P depth and trying to make a run to get into position.. Usually I waste all my battery and I have some not such nice friends after me (making all that noise)
I finally learned that even though I was way out of position.. I was usually in better position this time to make a good plot for the next time.. I would wait a couple hours till the convoy is gone, surface and get back in front of them..
Sometimes it takes me more than 2 times.. LOL but eventually I get it.
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