the problem with intercepting a task force is that these task forces are usually running along at 25+ knots... and at best your U-boat is going to crank out 17-18 knots depending on the weather.
If you use typical intercept tactics like you would on a 4 - 7 knot merchant convoy you will never find them, also you will have a difficult time interepting them if you are not already in an ideal position to do so at the moment your receive the report.
furthermore, it is my understanding that many convoys and task forces in GWX2 will change course slightly every few hours to throw off possible intercepts (just as they did in real life) so by the time you get to your estimated intercept point, they may have changed direction already and would therefore not be where you were expecting.
as far as intercepting contact reports go... be it a single ship, a warship a convoy or a task force... Task forces are the most difficult to ambush because your approach must be fast... but it must also be increadibly stealthy.
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