I did my first PT boat run for months last night, sailed about 4 miles, released 4 torps, killed a badly damaged CV and a destroyer.
to stand a chance of hitting anything you really need to be in front of the CVs 6-9 line, otherwise your going to be chasing it. coming in at 90deg works best for me, just aim for the cruiser and wait until the auto ack starts firing at you then release one. now start turning to lead the cv group and fire the others with a little delay between them so they fan out in front of the cvs path.
now the important bit: you
will get killed by the auto ack, so when you get in the tower start a timer/ look at you watch and just wait there for 4mins (roughly how long the torps run for.) if you launched off a CV, go into F5 mode and watch the enemy fleet for hits, although you wont see the torps running. hopefully the buffer will fill up and you'll get a ship destroyed message, or if you're really luck two

