Perhaps you are too good! Your suggestion about deploying 50% of the escorts at the front surely would leave the back door open, even though I agree with you that attacking from astern of the convoy is a much more difficult proposition from a manoeuvrability viewpoint. As you also point out, changing the way the escorts are deployed would not be accurate historically.
I believe that most u-boats made their approach to the convoy from the front, like you describe. Once an attack had been made the escorts immediately put plan Raspberry into operation. This plan was designed to combat u-boats that had sneaked past the escort screen and got in amongst the convoy. It was anticipated that once they had launched their attack the submarines would dive deep and lie silent, allowing the convoy to pass overhead then resurface behind the ships. Plan Raspberry called for the escorts to double back leaving the convoy to sail on. The escorts would then move behind the u-boat's estimated position, turn and in sailing back to rejoin the convoy, cross over where the sub was supposed to be dropping several patterns of depth charges.
If I remember rightly, the other plan the escorts used was called 'Pineapple' or 'Strawberry' can't quite remember which.
Nemo
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"I'm afraid there is no disguising the fact that King's obsession with the Pacific and the Battle of Washington cost us dear in the Battle of the Atlantic".
Sir John Slessor GCB, DSO, MC, DL
AOC-in-C Coastal Command RAF
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