Now I'm not using the GWX Mod, but it has been my experience, daylight hours, it is best to pull way out ahead of the convoy. Usually about 7500 - 10000m then turn at a 90 degree angle (port or starboard) to the convoy.
I use the "ruler" to "project" its path. Once thats done, I turn and try to get ahead of the projected path. (about 7500 -10000 m ahead) Turn again and go at flank speed until I'm within 2000 - 1700 m of the path. Dive to 13 m, order to "Rig for silent running," and lie in wait. Only raise the periscope to about 14 m mark.
If a DD getects you, wait until its within 500 m and order "Ahead Flank" and release your decoys. This will stop the DD's dead in thier tracks, and sometimes, they will even back off.
Anyway, that is what works for me.
Hope you have luck.
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