I think you need to gather more information on what the escorts are doing. Since they are more or less keeping with the convoy, you can plot out their courses by doing periodic checks on their bearings, and plotting their position on the map. Maybe there's a weak side you can exploit.
In any case, in your position, I would do an end-around manuever to get in front of the convoy's path and dive deep in silent running, to wait for the convoy to come to me. Once the hydrophones indicate that I am in the middle of the pack, I would go to periscope depth, fire as many torpedos as I can, and then immediately dive deep and travel diagonally away from and behind the merchants.
With 60% hull, I would not count on coming back for another run at the convoy, I would take what I get and strategically retreat. Make sure that in your retreat, you have your damage control team ready to ago, and don't hit silent running if you need repairs.
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