I have had GWX3 wolfpacks develop on several occasions but suspect that there may be a correlation between the accuracy of your initial course and speed estimates transmitted with the initial contact report and the appearance of the pack.
This is purely anecdotal (and the plural of anecdote is not data!) but those times when I have developed wolfpacks were when the convoy course and speed were very accurate right off the bat.
The thing is also probably date sensitive. By the time wolfpacks seemingly become the norm, in early 1942, you are generally forced to break contact because of radar equipped escorts or the intervention of aircraft.
-C
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