[RConch]

I have much better luck coming in from the front flank with decks awash. Alot depends on where are the escorts, if they are on the flanks of the convoy only it usually works. If one escort is in front, I stalk and hope the front escort moves out of the way. If not, try and take him out.
I have never had any luck sneaking in from the rear between the columns, once spotted all heck breaks loose with star shells. Talk about "standing in the spotlight".