[magic452]

I'd go for the night attack right off. Double your chances of success.
A little heavy weather wouldn't hurt.

Given the damage to your boat,
I go for a long range vector analysis attack form 3000 yards with an approach angle of about 70°, that should get you clear of the escorts for a clean shot.
You should have a lead angle of about 12 or so degrees.

Given the state of the torpedoes use at least one extra, shoot at or in front of the bow, that will force her to hold speed, aim the rest at the magazines.

Get out of Dodge and do a run around and repeat. At 10 Kt. should have plenty of time to do a end run. Should be able to get both BB's

Magic